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Dnscmd

A command-line interface for managing DNS servers. This utility is useful in scripting batch files to help automate routine DNS management tasks, or to perform simple unattended setup and configuration of new DNS servers on your network.

Syntax

dnscmd <servername> <command> [<command parameters>]

Parameters

Parameter Description
<servername> The IP address or host name of a remote or local DNS server.

dnscmd /ageallrecords command

Sets the current time on a time stamp on resource records at a specified zone or node on a DNS server.

Syntax

dnscmd [<servername>] /ageallrecords <zonename>[<nodename>] | [/tree]|[/f]

Parameters

Parameter Description
<servername> Specifies the DNS server that the administrator plans to manage, represented by IP address, fully qualified domain name (FQDN), or Host name. If this parameter is omitted, the local server is used.
<zonename> Specifies the FQDN of the zone.
<nodename> Specifies a specific node or subtree in the zone, using the following:
  • @ for root zone or FQDN
  • The FQDN of a node (the name with a period (.) at the end)
  • A single label for the name relative to the zone root.
/tree Specifies that all child nodes also receive the time stamp.
/f Runs the command without asking for confirmation.
Remarks

  • The ageallrecords command is for backward compatibility between the current version of DNS and previous releases of DNS in which aging and scavenging weren't supported. It adds a time stamp with the current time to resource records that don't have a time stamp, and it sets the current time on resource records that do have a time stamp.

  • Record scavenging doesn't occur unless the records are time stamped. Name server (NS) resource records, start of authority (SOA) resource records, and Windows Internet Name Service (WINS) resource records aren't included in the scavenging process, and they aren't time stamped even when the ageallrecords command runs.

  • This command fails unless scavenging is enabled for the DNS server and the zone. For information about how to enable scavenging for the zone, see the aging parameter, within the syntax of the dnscmd /config command in this article.

  • The addition of a time stamp to DNS resource records makes them incompatible with DNS servers that run on operating systems other than Windows Server. A time stamp added by using the ageallrecords command can't be reversed.

  • If none of the optional parameters are specified, the command returns all resource records at the specified node. If a value is specified for at least one of the optional parameters, dnscmd enumerates only the resource records that correspond to the value or values that are specified in the optional parameter or parameters.

Examples

Example 1: Set the current time on a time stamp to resource records.

dnscmd /clearcache command

Clears the DNS cache memory of resource records on the specified DNS server.

Syntax

dnscmd [<servername>] /clearcache

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.

Example

dnscmd dnssvr1.contoso.com /clearcache

dnscmd /config command

Changes values in the registry for the DNS server and individual zones. This command also modifies the configuration of the specified server. Accepts server-level and zone-level settings.

Caution

Don't edit the registry directly unless you have no alternative. The registry editor bypasses standard safeguards, allowing settings that can degrade performance, damage your system, or even require you to reinstall Windows. You can safely alter most registry settings by using the programs in Control Panel or Microsoft Management Console (mmc). If you must edit the registry directly, back it up first. Read the registry editor help for more information.

Server-level syntax

dnscmd [<servername>] /config <parameter>

Parameters

Note

This article contains references to the term slave, a term that Microsoft no longer uses. When the term is removed from the software, we’ll remove it from this article.

Parameters Description
<servername> Specifies the DNS server that you're planning to manage, represented by local computer syntax, IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<parameter> Specify a setting and, as an option, a value. Parameter values use this syntax: parameter [value].
/addressanswerlimit[0|5-28] Specifies the maximum number of host records that a DNS server can send in response to a query. The value can be zero (0), or it can be in the range of 5 through 28 records. The default value is zero (0).
/bindsecondaries[0|1] Changes the format of the zone transfer so that it can achieve maximum compression and efficiency. Accepts the values:
  • 0 - Uses maximum compression and is compatible with BIND versions 4.9.4 and later only
  • 1 - Sends only one resource record per message to non-Microsoft DNS servers and is compatible with BIND versions earlier than 4.9.4. This is the default setting.
/bootmethod[0|1|2|3] Determines the source from which the DNS server gets its configuration information. Accepts the values:
  • 0 - Clears the source of configuration information.
  • 1 - Loads from the BIND file that is located in the DNS directory, which is %systemroot%\System32\DNS by default.
  • 2 - Loads from the registry.
  • 3 - Loads from AD DS and the registry. This is the default setting.
/defaultagingstate[0|1] Determines whether the DNS scavenging feature is enabled by default on newly created zones. Accepts the values:
  • 0 - Disables scavenging. This is the default setting.
  • 1 - Enables scavenging.
/defaultnorefreshinterval[0x1-0xFFFFFFFF|0xA8] Sets a period of time in which no refreshes are accepted for dynamically updated records. Zones on the server inherit this value automatically.

To change the default value, type a value in the range of 0x1-0xFFFFFFFF. The default value from the server is 0xA8.
/defaultrefreshinterval [0x1-0xFFFFFFFF|0xA8] Sets a period of time that is allowed for dynamic updates to DNS records. Zones on the server inherit this value automatically.

To change the default value, type a value in the range of 0x1-0xFFFFFFFF. The default value from the server is 0xA8.
/disableautoreversezones [0|1] Enables or disables the automatic creation of reverse lookup zones. Reverse lookup zones provide resolution of Internet Protocol (IP) addresses to DNS domain names. Accepts the values:
  • 0 - Enables the automatic creation of reverse lookup zones. This is the default setting.
  • 1 - Disables the automatic creation of reverse lookup zones.
/disablensrecordsautocreation [0|1] Specifies whether the DNS server automatically creates name server (NS) resource records for zones that it hosts. Accepts the values:
  • 0 - Automatically creates name server (NS) resource records for zones that the DNS server hosts.
  • 1 - Doesn't automatically create name server (NS) resource records for zones that the DNS server hosts.
/dspollinginterval <seconds> Specifies in seconds how often the DNS server polls AD DS for changes in the AD integrated zones. The minimum accepted value is 30 seconds. If a value isn't specified after this parameter, the default value is set to 0xB4 (3 minutes or 180 seconds).
/dstombstoneinterval <seconds> The amount of time in seconds to retain deleted records in AD DS. This value should be limited to the range from 0x3F480 (3 days or 259,200 seconds) to 0x49D400 (8 weeks or 4,147,200 seconds). The default value should be 0x127500 (14 days or 1,209,600 seconds) if no value is specified for the tombstoneLifetime attribute of the Directory Services object.
/ednscachetimeout [3600-15724800] Specifies the number of seconds that extended DNS (EDNS) information is cached. The minimum value is 3600, and the maximum value is 15,724,800. The default value is 604,800 seconds (one week).
/enableednsprobes [0|1] Enables or disables the server to probe other servers to determine if they support EDNS. Accepts the values:
  • 0 - Disables active support for EDNS probes.
  • 1 - Enables active support for EDNS probes.
/enablednssec [0|1] Enables or disables support for DNS Security Extensions (DNSSEC). Accepts the values:
  • 0 - Disables DNSSEC.
  • 1 - Enables DNSSEC.
/enableglobalnamessupport [0|1] Enables or disables support for the GlobalNames zone. The GlobalNames zone supports resolution of single-label DNS names across a forest. Accepts the values:
  • 0 - Disables support for the GlobalNames zone. When you set the value of this command to 0, the DNS Server service doesn't resolve single-label names in the GlobalNames zone.
  • 1 - Enables support for the GlobalNames zone. When you set the value of this command to 1, the DNS Server service resolves single-label names in the GlobalNames zone.
/enableglobalqueryblocklist [0|1] Enables or disables support for the global query block list that blocks name resolution for names in the list. The DNS Server service creates and enables the global query block list by default when the service starts the first time. To view the current global query block list, use the dnscmd /info /globalqueryblocklist command. Accepts the values:
  • 0 - Disables support for the global query block list. When you set the value of this command to 0, the DNS Server service responds to queries for names in the block list.
  • 1 - Enables support for the global query block list. When you set the value of this command to 1, the DNS Server service doesn't respond to queries for names in the block list.
/eventloglevel [0|1|2|4] Determines which events are logged in the DNS server log in Event Viewer. Accepts the values:
  • 0 - Logs no events.
  • 1 - Logs only errors.
  • 2 - Logs only errors and warnings.
  • 4 - Logs errors, warnings, and informational events. This is the default setting.
/forwarddelegations [0|1] Determines how the DNS server handles a query for a delegated subzone. These queries can be sent either to the subzone that is referred to in the query or to the list of forwarders that is named for the DNS server. Entries in the setting are used only when forwarding is enabled. Accepts the values:
  • 0 - Automatically sends queries that refer to delegated subzones to the appropriate subzone. This is the default setting.
  • 1 - Forwards queries that refer to the delegated subzone to the existing forwarders.
/forwardingtimeout [<seconds>] Determines how many seconds (0x1-0xFFFFFFFF) a DNS server waits for a forwarder to respond before trying another forwarder. The default value is 0x5, which is 5 seconds.
/globalneamesqueryorder [0|1] Specifies whether the DNS Server service looks first in the GlobalNames zone or local zones when it resolves names. Accepts the values:
  • 0 - The DNS Server service attempts to resolve names by querying the GlobalNames zone before it queries the zones for which it's authoritative.
  • 1 - The DNS Server service attempts to resolve names by querying the zones for which it's authoritative before it queries the GlobalNames zone.
/globalqueryblocklist[[<name> [<name>]...] Replaces the current global query block list with a list of the names that you specify. If you don't specify any names, this command clears the block list. By default, the global query block list contains the following items:
  • isatap
  • wpad
The DNS Server service can remove either or both of these names when it starts the first time, if it finds these names in an existing zone.
/isslave [0|1] Determines how the DNS server responds when queries that it forwards receive no response. Accepts the values:
  • 0 - Specifies that the DNS server isn't a subordinate. If the forwarder doesn't respond, the DNS server attempts to resolve the query itself. This is the default setting.
  • 1 - Specifies that the DNS server is a subordinate. If the forwarder doesn't respond, the DNS server terminates the search and sends a failure message to the resolver.
/localnetpriority [0|1] Determines the order in which host records are returned when the DNS server has multiple host records for the same name. Accepts the values:
  • 0 - Returns the records in the order in which they're listed in the DNS database.
  • 1 - Returns the records that have similar IP network addresses first. This is the default setting.
/logfilemaxsize [<size>] Specifies the maximum size in bytes (0x10000-0xFFFFFFFF) of the Dns.log file. When the file reaches its maximum size, DNS overwrites the oldest events. The default size is 0x400000, which is 4 megabytes (MB).
/logfilepath [<path+logfilename>] Specifies the path of the Dns.log file. The default path is %systemroot%\System32\Dns\Dns.log. You can specify a different path by using the format path+logfilename.
/logipfilterlist <IPaddress> [,<IPaddress>...] Specifies which packets are logged in the debug log file. The entries are a list of IP addresses. Only packets going to and from the IP addresses in the list are logged.
/loglevel [<eventtype>] Determines which types of events are recorded in the Dns.log file. Each event type is represented by a hexadecimal number. If you want more than one event in the log, use hexadecimal addition to add the values, and then enter the sum. Accepts the values:
  • 0x0 - The DNS server doesn't create a log. This is the default entry.
  • 0x10 - Logs queries and notifications.
  • 0x20 - Logs updates.
  • 0xFE - Logs nonquery transactions.
  • 0x100 - Logs question transactions.
  • 0x200 - Logs answers.
  • 0x1000 - Logs send packets.
  • 0x2000 - Logs receive packets.
  • 0x4000 - Logs User Datagram Protocol (UDP) packets.
  • 0x8000 - Logs Transmission Control Protocol (TCP) packets.
  • 0xFFFF - Logs all packets.
  • 0x10000 - Logs active directory write transactions.
  • 0x20000 - Logs active directory update transactions.
  • 0x1000000 - Logs full packets.
  • 0x80000000 - Logs write-through transactions.
/maxcachesize Specifies the maximum size, in kilobytes (KB), of the DNS server s memory cache.
/maxcachettl [<seconds>] Determines how many seconds (0x0-0xFFFFFFFF) a record is saved in the cache. If the 0x0 setting is used, the DNS server doesn't cache records. The default setting is 0x15180 (86,400 seconds or 1 day).
/maxnegativecachettl [<seconds>] Specifies how many seconds (0x1-0xFFFFFFFF) an entry that records a negative answer to a query remains stored in the DNS cache. The default setting is 0x384 (900 seconds).
/namecheckflag [0|1|2|3] Specifies which character standard is used when checking DNS names. Accepts the values:
  • 0 - Uses ANSI characters that comply with Internet Engineering Task force (IETF) Request for Comments (Rfcs).
  • 1 - Uses ANSI characters that don't necessarily comply with IETF Rfcs.
  • 2 - Uses multibyte UCS Transformation format 8 (UTF-8) characters. This is the default setting.
  • 3 - Uses all characters.
/norecursion [0|1] Determines whether a DNS server performs recursive name resolution. Accepts the values:
  • 0 - The DNS server performs recursive name resolution if it's requested in a query. This is the default setting.
  • 1 - The DNS server doesn't perform recursive name resolution.
/notcp This parameter is obsolete, and it has no effect in current versions of Windows Server.
/recursionretry [<seconds>] Determines the number of seconds (0x1-0xFFFFFFFF) that a DNS server waits before again trying to contact a remote server. The default setting is 0x3 (three seconds). This value should be increased when recursion occurs over a slow wide area network (WAN) link.
/recursiontimeout [<seconds>] Determines the number of seconds (0x1-0xFFFFFFFF) that a DNS server waits before discontinuing attempts to contact a remote server. The settings range from 0x1 through 0xFFFFFFFF. The default setting is 0xF (15 seconds). This value should be increased when recursion occurs over a slow WAN link.
/roundrobin [0|1] Determines the order in which host records are returned when a server has multiple host records for the same name. Accepts the values:
  • 0 - The DNS server doesn't use round robin. Instead, it returns the first record to every query.
  • 1 - The DNS server rotates among the records that it returns from the top to the bottom of the list of matching records. This is the default setting.
/rpcprotocol [0x0|0x1|0x2|0x4|0xFFFFFFFF] Specifies the protocol that remote procedure call (RPC) uses when it makes a connection from the DNS server. Accepts the values:
  • 0x0 - Disables RPC for DNS.
  • 0x01 - Uses TCP/IP
  • 0x2 - Uses named pipes.
  • 0x4 - Uses local procedure call (LPC).
  • 0xFFFFFFFF - All protocols. This is the default setting.
/scavenginginterval [<hours>] Determines whether the scavenging feature for the DNS server is enabled, and sets the number of hours (0x0-0xFFFFFFFF) between scavenging cycles. The default setting is 0x0, which disables scavenging for the DNS server. A setting greater than 0x0 enables scavenging for the server and sets the number of hours between scavenging cycles.
/secureresponses [0|1] Determines whether DNS filters records that are saved in a cache. Accepts the values:
  • 0 - Saves all responses to name queries to a cache. This is the default setting.
  • 1 - Saves only the records that belong to the same DNS subtree to a cache.
/sendport [<port>] Specifies the port number (0x0-0xFFFFFFFF) that DNS uses to send recursive queries to other DNS servers. The default setting is 0x0, which means that the port number is selected randomly.
/serverlevelplugindll[<dllpath>] Specifies the path of a custom plug-in. When Dllpath specifies the fully qualified path name of a valid DNS server plug-in, the DNS server calls functions in the plug-in to resolve name queries that are outside the scope of all locally hosted zones. If a queried name is out of the scope of the plug-in, the DNS server performs name resolution using forwarding or recursion, as configured. If Dllpath isn't specified, the DNS server ceases to use a custom plug-in if a custom plug-in was previously configured.
/strictfileparsing [0|1] Determines a DNS server's behavior when it encounters an erroneous record while loading a zone. Accepts the values:
  • 0 - The DNS server continues to load the zone even if the server encounters an erroneous record. The error is recorded in the DNS log. This is the default setting.
  • 1 - The DNS server stops loading the zone, and it records the error in the DNS log.
/updateoptions <RecordValue> Prohibits dynamic updates of specified types of records. If you want more than one record type to be prohibited in the log, use hexadecimal addition to add the values, and then enter the sum. Accepts the values:
  • 0x0 - Doesn't restrict any record types.
  • 0x1 - Excludes start of authority (SOA) resource records.
  • 0x2 - Excludes name server (NS) resource records.
  • 0x4 - Excludes delegation of name server (NS) resource records.
  • 0x8 - Excludes server host records.
  • 0x100 - During secure dynamic update, excludes start of authority (SOA) resource records.
  • 0x200 - During secure dynamic update, excludes root name server (NS) resource records.
  • 0x30F - During standard dynamic update, excludes name server (NS) resource records, start of authority (SOA) resource records, and server host records. During secure dynamic update, excludes root name server (NS) resource records and start of authority (SOA) resource records. Allows delegations and server host updates.
  • 0x400 - During secure dynamic update, excludes delegation name server (NS) resource records.
  • 0x800 - During secure dynamic update, excludes server host records.
  • 0x1000000 - Excludes delegation signer (DS) records.
  • 0x80000000 - Disables DNS dynamic update.
/writeauthorityns [0|1] Determines when the DNS server writes name server (NS) resource records in the Authority section of a response. Accepts the values:
  • 0 - Writes name server (NS) resource records in the Authority section of referrals only. This setting complies with Rfc 1034, Domain names concepts and facilities, and with Rfc 2181, Clarifications to the DNS Specification. This is the default setting.
  • 1 - Writes name server (NS) resource records in the Authority section of all successful authoritative responses.
/xfrconnecttimeout [<seconds>] Determines the number of seconds (0x0-0xFFFFFFFF) a primary DNS server waits for a transfer response from its secondary server. The default value is 0x1E (30 seconds). After the time-out value expires, the connection is terminated.

Zone-level syntax

Modifies the configuration of the specified zone. The zone name must be specified only for zone-level parameters.

dnscmd /config <parameters>

Parameters

Parameters Description
<parameter> Specify a setting, a zone name, and, as an option, a value. Parameter values use this syntax: zonename parameter [value].
/aging <zonename> Enables or disables scavenging in a specific zone.
/allownsrecordsautocreation <zonename> [value] Overrides the DNS server's name server (NS) resource record autocreation setting. Name server (NS) resource records that were previously registered for this zone aren't affected. Therefore, you must remove them manually if you don't want them.
/allowupdate <zonename> Determines whether the specified zone accepts dynamic updates.
/forwarderslave <zonename> Overrides the DNS server /isslave setting.
/forwardertimeout <zonename> Determines how many seconds a DNS zone waits for a forwarder to respond before trying another forwarder. This value overrides the value that is set at the server level.
/norefreshinterval <zonename> Sets a time interval for a zone during which no refreshes can dynamically update DNS records in a specified zone.
/refreshinterval <zonename> Sets a time interval for a zone during which refreshes can dynamically update DNS records in a specified zone.
/securesecondaries <zonename> Determines which secondary servers can receive zone updates from the primary server for this zone.

dnscmd /createbuiltindirectorypartitions command

Creates a DNS application directory partition. When DNS is installed, an application directory partition for the service is created at the forest and domain levels. Use this command to create DNS application directory partitions that were deleted or never created. With no parameter, this command creates a built-in DNS directory partition for the domain.

Syntax

dnscmd [<servername>] /createbuiltindirectorypartitions [/forest] [/alldomains]

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
/forest Creates a DNS directory partition for the forest.
/alldomains Creates DNS partitions for all domains in the forest.

dnscmd /createdirectorypartition command

Creates a DNS application directory partition. When DNS is installed, an application directory partition for the service is created at the forest and domain levels. This operation creates additional DNS application directory partitions.

Syntax

dnscmd [<servername>] /createdirectorypartition <partitionFQDN>

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<partitionFQDN> The FQDN of the DNS application directory partition that will be created.

dnscmd /deletedirectorypartition command

Removes an existing DNS application directory partition.

Syntax

dnscmd [<servername>] /deletedirectorypartition <partitionFQDN>

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<partitionFQDN> The FQDN of the DNS application directory partition that will be removed.

dnscmd /directorypartitioninfo command

Lists information about a specified DNS application directory partition.

Syntax

dnscmd [<servername>] /directorypartitioninfo <partitionFQDN> [/detail]

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<partitionFQDN> The FQDN of the DNS application directory partition.
/detail Lists all information about the application directory partition.

dnscmd /enlistdirectorypartition command

Adds the DNS server to the specified directory partition's replica set.

Syntax

dnscmd [<servername>] /enlistdirectorypartition <partitionFQDN>

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<partitionFQDN> The FQDN of the DNS application directory partition.

dnscmd /enumdirectorypartitions command

Lists the DNS application directory partitions for the specified server.

Syntax

dnscmd [<servername>] /enumdirectorypartitions [/custom]

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
/custom Lists only user-created directory partitions.

dnscmd /enumrecords command

Lists the resource records of a specified node in a DNS zone.

Syntax

dnscmd [<servername>] /enumrecords <zonename> <nodename> [/type <rrtype> <rrdata>] [/authority] [/glue] [/additional] [/node | /child | /startchild<childname>] [/continue | /detail]

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
/enumrecords Lists resource records in the specified zone.
<zonename> Specifies the name of the zone to which the resource records belong.
<nodename> Specifies the name of the node of the resource records.
[/type <rrtype> <rrdata>] Specifies the type of resource records to be listed and the type of data that is expected. Accepts the values:
  • <rrtype> - Specifies the type of resource records to be listed.
  • <rrdata> - Specifies the type of data that is expected record.
/authority Includes authoritative data.
/glue Includes glue data.
/additional Includes all additional information about the listed resource records.
/node Lists only the resource records of the specified node.
/child Lists only the resource records of a specified child domain.
/startchild<childname> Begins the list at the specified child domain.
/continue Lists only the resource records with their type and data.
/detail Lists all information about the resource records.

Example

dnscmd /enumrecords test.contoso.com test /additional

dnscmd /enumzones command

Lists the zones that exist on the specified DNS server. The enumzones parameters act as filters on the list of zones. If no filters are specified, a complete list of zones is returned. When a filter is specified, only the zones that meet that filter's criteria are included in the returned list of zones.

Syntax

dnscmd [<servername>] /enumzones [/primary | /secondary | /forwarder | /stub | /cache | /auto-created] [/forward | /reverse | /ds | /file] [/domaindirectorypartition | /forestdirectorypartition | /customdirectorypartition | /legacydirectorypartition | /directorypartition <partitionFQDN>]

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
/primary Lists all zones that are either standard primary zones or active directory integrated zones.
/secondary Lists all standard secondary zones.
/forwarder Lists zones that forward unresolved queries to another DNS server.
/stub Lists all stub zones.
/cache Lists only the zones that are loaded into the cache.
/auto-created] Lists the zones that were created automatically during the DNS server installation.
/forward Lists forward lookup zones.
/reverse Lists reverse lookup zones.
/ds Lists active directory integrated zones.
/file Lists zones that are backed by files.
/domaindirectorypartition Lists zones that are stored in the domain directory partition.
/forestdirectorypartition Lists zones that are stored in the forest DNS application directory partition.
/customdirectorypartition Lists all zones that are stored in a user-defined application directory partition.
/legacydirectorypartition Lists all zones that are stored in the domain directory partition.
/directorypartition <partitionFQDN> Lists all zones that are stored in the specified directory partition.

Examples

dnscmd /exportsettings command

Creates a text file that lists the configuration details of a DNS server. The text file is named DnsSettings.txt. It's located in the %systemroot%\system32\dns directory of the server. You can use the information in the file that dnscmd /exportsettings creates to troubleshoot configuration problems or to ensure that you have configured multiple servers identically.

Syntax

dnscmd [<servername>] /exportsettings

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.

dnscmd /info command

Displays settings from the DNS section of the registry of the specified server HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DNS\Parameters. To display zone-level registry settings, use the dnscmd zoneinfo command.

Syntax

dnscmd [<servername>] /info [<settings>]

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<settings> Any setting that the info command returns can be specified individually. If a setting isn't specified, a report of common settings is returned.

Example

dnscmd /ipvalidate command

Tests whether an IP address identifies a functioning DNS server or whether the DNS server can act as a forwarder, a root hint server, or a primary server for a specific zone.

Syntax

dnscmd [<servername>] /ipvalidate <context> [<zonename>] [[<IPaddress>]]

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<context> Specifies the type of test to perform. You can specify any of the following tests:
  • /dnsservers - Tests that the computers with the addresses that you specify are functioning DNS servers.
  • /forwarders - Tests that the addresses that you specify identify DNS servers that can act as forwarders.
  • /roothints - Tests that the addresses that you specify identify DNS servers that can act as root hint name servers.
  • /zonemasters - Tests that the addresses that you specify identify DNS servers that are primary servers for zonename.
<zonename> Identifies the zone. Use this parameter with the /zonemasters parameter.
<IPaddress> Specifies the IP addresses that the command tests.

Examples

nscmd dnssvr1.contoso.com /ipvalidate /dnsservers 10.0.0.1 10.0.0.2
dnscmd dnssvr1.contoso.com /ipvalidate /zonemasters corp.contoso.com 10.0.0.2

dnscmd /nodedelete command

Deletes all records for a specified host.

Syntax

dnscmd [<servername>] /nodedelete <zonename> <nodename> [/tree] [/f]

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<zonename> Specifies the name of the zone.
<nodename> Specifies the host name of the node to delete.
/tree Deletes all the child records.
/f Executes the command without asking for confirmation.

Example

Example 6: Delete the records from a node.

dnscmd /recordadd command

Adds a record to a specified zone in a DNS server.

Syntax

dnscmd [<servername>] /recordadd <zonename> <nodename> <rrtype> <rrdata>

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<zonename> Specifies the zone in which the record resides.
<nodename> Specifies a specific node in the zone.
<rrtype> Specifies the type of record to be added.
<rrdata> Specifies the type of data that is expected.

Note

After you add a record, make sure that you use the correct data type and data format. For a list of resource record types and the appropriate data types, see Dnscmd Examples.

Examples

dnscmd dnssvr1.contoso.com /recordadd test A 10.0.0.5
dnscmd /recordadd test.contoso.com test MX 10 mailserver.test.contoso.com

dnscmd /recorddelete command

Deletes a resource record to a specified zone.

Syntax

dnscmd [<servername>] /recorddelete <zonename> <nodename> <rrtype> <rrdata> [/f]

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<zonename> Specifies the zone in which the resource record resides.
<nodename> Specifies a name of the host.
<rrtype> Specifies the type of resource record to be deleted.
<rrdata> Specifies the type of data that is expected.
/f Executes the command without asking for confirmation. Because nodes can have more than one resource record, this command requires you to be specific about the type of resource record that you want to delete. If you specify a data type and you don't specify a type of resource record data, all records with that specific data type for the specified node are deleted.

Examples

dnscmd /recorddelete test.contoso.com test MX 10 mailserver.test.contoso.com

dnscmd /resetforwarders command

Selects or resets the IP addresses to which the DNS server forwards DNS queries when it can't resolve them locally.

Syntax

dnscmd [<servername>] /resetforwarders <IPaddress> [,<IPaddress>]...][/timeout <timeout>] [/slave | /noslave]

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<IPaddress> Lists the IP addresses to which the DNS server forwards unresolved queries.
/timeout <timeout> Sets the number of seconds that the DNS server waits for a response from the forwarder. By default, this value is five seconds.
/slave Prevents the DNS server from performing its own iterative queries if the forwarder fails to resolve a query.
/noslave Allows the DNS server to perform its own iterative queries if the forwarder fails to resolve a query. This is the default setting.
/f Executes the command without asking for confirmation. Because nodes can have more than one resource record, this command requires you to be specific about the type of resource record that you want to delete. If you specify a data type and you don't specify a type of resource record data, all records with that specific data type for the specified node are deleted.
Remarks

  • By default, a DNS server performs iterative queries when it can't resolve a query.

  • Setting IP addresses by using the resetforwarders command causes the DNS server to perform recursive queries to the DNS servers at the specified IP addresses. If the forwarders don't resolve the query, the DNS server can then perform its own iterative queries.

  • If the /slave parameter is used, the DNS server doesn't perform its own iterative queries. This means that the DNS server forwards unresolved queries only to the DNS servers in the list, and it doesn't attempt iterative queries if the forwarders don't resolve them. It's more efficient to set one IP address as a forwarder for a DNS server. You can use the resetforwarders command for internal servers in a network to forward their unresolved queries to one DNS server that has an external connection.

  • Listing a forwarder's IP address twice causes the DNS server to attempt to forward to that server twice.

Examples

dnscmd dnssvr1.contoso.com /resetforwarders 10.0.0.1 /timeout 7 /slave
dnscmd dnssvr1.contoso.com /resetforwarders /noslave

dnscmd /resetlistenaddresses command

Specifies the IP addresses on a server that listens for DNS client requests. By default, all IP addresses on a DNS server listen for client DNS requests.

Syntax

dnscmd [<servername>] /resetlistenaddresses <listenaddress>

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<listenaddress> Specifies an IP address on the DNS server that listens for DNS client requests. If no listen address is specified, all IP addresses on the server listen for client requests.

Examples

dnscmd dnssvr1.contoso.com /resetlistenaddresses 10.0.0.1

dnscmd /startscavenging command

Tells a DNS server to attempt an immediate search for stale resource records in a specified DNS server.

Syntax

dnscmd [<servername>] /startscavenging

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
Remarks

  • Successful completion of this command starts a scavenge immediately. If the scavenge fails, no warning message appears.

  • Although the command to start the scavenge appears to complete successfully, the scavenge doesn't start unless the following preconditions are met:

    • Scavenging is enabled for both the server and the zone.

    • The zone is started.

    • The resource records have a time stamp.

  • For information about how to enable scavenging for the server, see the scavenginginterval parameter under Server-level syntax in the /config section.

  • For information about how to enable scavenging for the zone, see the aging parameter under Zone-level syntax in the /config section.

  • For information about how to restart a paused zone, see the zoneresume parameter in this article.

  • For information about how to check resource records for a time stamp, see the ageallrecords parameter in this article.

Examples

dnscmd dnssvr1.contoso.com /startscavenging

dnscmd /statistics command

Displays or clears data for a specified DNS server.

Syntax

dnscmd [<servername>] /statistics [<statid>] [/clear]

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<statid> Specifies which statistic or combination of statistics to display. The statistics command displays counters that begin on the DNS server when it's started or resumed. An identification number is used to identify a statistic. If no statistic ID number is specified, all statistics display. The numbers that can be specified, along with the corresponding statistic that displays, can include:
  • 00000001 - Time
  • 00000002 - Query
  • 00000004 - Query2
  • 00000008 - Recurse
  • 00000010 - Master
  • 00000020 - Secondary
  • 00000040 - WINS
  • 00000100 - Update
  • 00000200 - SkwanSec
  • 00000400 - Ds
  • 00010000 - Memory
  • 00100000 - PacketMem
  • 00040000 - Dbase
  • 00080000 - Records
  • 00200000 - NbstatMem
  • /clear - Resets the specified statistics counter to zero.

Examples

dnscmd /unenlistdirectorypartition command

Removes the DNS server from the specified directory partition's replica set.

Syntax

dnscmd [<servername>] /unenlistdirectorypartition <partitionFQDN>

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<partitionFQDN> The FQDN of the DNS application directory partition that will be removed.

dnscmd /writebackfiles command

Checks the DNS server memory for changes, and writes them to persistent storage. The writebackfiles command updates all dirty zones or a specified zone. A zone is dirty when there are changes in memory that haven't yet been written to persistent storage. This is a server-level operation that checks all zones. You can specify one zone in this operation or you can use the zonewriteback operation.

Syntax

dnscmd [<servername>] /writebackfiles <zonename>

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<zonename> Specifies the name of the zone to be updated.

Examples

dnscmd dnssvr1.contoso.com /writebackfiles

dnscmd /zoneadd command

Adds a zone to the DNS server.

Syntax

dnscmd [<servername>] /zoneadd <zonename> <zonetype> [/dp <FQDN> | {/domain | enterprise | legacy}]

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<zonename> Specifies the name of the zone.
<zonetype> Specifies the type of zone to create. Specifying a zone type of /forwarder or /dsforwarder creates a zone that performs conditional forwarding. Each zone type has different required parameters:
  • /dsprimary - Creates an active directory integrated zone.
  • /primary /file <filename> - Creates a standard primary zone, and specifies the name of the file that will store the zone information.
  • /secondary <masterIPaddress> [<masterIPaddress>...] - Creates a standard secondary zone.
  • /stub <masterIPaddress> [<masterIPaddress>...] /file <filename> - Creates a file-backed stub zone.
  • /dsstub <masterIPaddress> [<masterIPaddress>...] - Creates an active directory integrated stub zone.
  • /forwarder <masterIPaddress> [<masterIPaddress>]... /file <filename> - Specifies that the created zone forwards unresolved queries to another DNS server.
  • /dsforwarder - Specifies that the created active directory integrated zone forwards unresolved queries to another DNS server.
<FQDN> Specifies FQDN of the directory partition.
/domain Stores the zone on the domain directory partition.
/enterprise Stores the zone on the enterprise directory partition.
/legacy Stores the zone on a legacy directory partition.

Examples

dnscmd dnssvr1.contoso.com /zoneadd test.contoso.com /dsprimary
dnscmd dnssvr1.contoso.com /zoneadd secondtest.contoso.com /secondary 10.0.0.2

dnscmd /zonechangedirectorypartition command

Changes the directory partition on which the specified zone resides.

Syntax

dnscmd [<servername>] /zonechangedirectorypartition <zonename> {[<newpartitionname>] | [<zonetype>]}

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<zonename> The FQDN of the current directory partition on which the zone resides.
<newpartitionname> The FQDN of the directory partition that the zone will be moved to.
<zonetype> Specifies the type of directory partition that the zone will be moved to.
/domain Moves the zone to the built-in domain directory partition.
/forest Moves the zone to the built-in forest directory partition.
/legacy Moves the zone to the directory partition that is created for pre active directory domain controllers. These directory partitions aren't necessary for native mode.

dnscmd /zonedelete command

Deletes a specified zone.

Syntax

dnscmd [<servername>] /zonedelete <zonename> [/dsdel] [/f]

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<zonename> Specifies the name of the zone to be deleted.
/dsdel Deletes the zone from Azure Directory Domain Services (AD DS).
/f Runs the command without asking for confirmation.

Examples

dnscmd /zoneexport command

Creates a text file that lists the resource records of a specified zone. The zoneexport operation creates a file of resource records for an active directory integrated zone for troubleshooting purposes. By default, the file that this command creates is placed in the DNS directory, which is by default the %systemroot%/System32/Dns directory.

Syntax

dnscmd [<servername>] /zoneexport <zonename> <zoneexportfile>

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<zonename> Specifies the name of the zone.
<zoneexportfile> Specifies the name of the file to create.

Examples

dnscmd /zoneinfo

Displays settings from the section of the registry of the specified zone: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DNS\Parameters\Zones\<zonename>

Syntax

dnscmd [<servername>] /zoneinfo <zonename> [<setting>]

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<zonename> Specifies the name of the zone.
<setting> You can individually specify any setting that the zoneinfo command returns. If you don't specify a setting, all settings are returned.
Remarks

  • To display server-level registry settings, use the /info command.

  • To see a list of settings that you can display with this command, see the /config command.

Examples

dnscmd /zonepause command

Pauses the specified zone, which then ignores query requests.

Syntax

dnscmd [<servername>] /zonepause <zonename>

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<zonename> Specifies the name of the zone to be paused.
Remarks
  • To resume a zone and make it available after it has been paused, use the /zoneresume command.

Examples

dnscmd dnssvr1.contoso.com /zonepause test.contoso.com

dnscmd /zoneprint command

Lists the records in a zone.

Syntax

dnscmd [<servername>] /zoneprint <zonename>

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<zonename> Specifies the name of the zone to be listed.

dnscmd /zonerefresh command

Forces a secondary DNS zone to update from the master zone.

Syntax

dnscmd [<servername>] /zonerefresh <zonename>

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<zonename> Specifies the name of the zone to be refreshed.
Remarks

  • The zonerefresh command forces a check of the version number in the primary server s start of authority (SOA) resource record. If the version number on the primary server is higher than the secondary server's version number, a zone transfer is initiated that updates the secondary server. If the version number is the same, no zone transfer occurs.

  • The forced check occurs by default every 15 minutes. To change the default, use the dnscmd config refreshinterval command.

Examples

dnscmd dnssvr1.contoso.com /zonerefresh test.contoso.com

dnscmd /zonereload command

Copies zone information from its source.

Syntax

dnscmd [<servername>] /zonereload <zonename>

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<zonename> Specifies the name of the zone to be reloaded.
Remarks

  • If the zone is active directory integrated, it reloads from Active Directory Domain Services (AD DS).

  • If the zone is a standard file-backed zone, it reloads from a file.

Examples

dnscmd dnssvr1.contoso.com /zonereload test.contoso.com

dnscmd /zoneresetmasters command

Resets the IP addresses of the primary server that provides zone transfer information to a secondary zone.

Syntax

dnscmd [<servername>] /zoneresetmasters <zonename> [/local] [<IPaddress> [<IPaddress>]...]

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<zonename> Specifies the name of the zone to be reset.
/local Sets a local master list. This parameter is used for active directory integrated zones.
<IPaddress> The IP addresses of the primary servers of the secondary zone.
Remarks
  • This value is originally set when the secondary zone is created. Use the zoneresetmasters command on the secondary server. This value has no effect if it's set on the master DNS server.

Examples

dnscmd dnssvr1.contoso.com /zoneresetmasters test.contoso.com 10.0.0.1
dnscmd dnssvr1.contoso.com /zoneresetmasters test.contoso.com /local

dnscmd /zoneresetscavengeservers command

Changes the IP addresses of the servers that can scavenge the specified zone.

Syntax

dnscmd [<servername>] /zoneresetscavengeservers <zonename> [/local] [<IPaddress> [<IPaddress>]...]

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<zonename> Specifies the zone to scavenge.
/local Sets a local master list. This parameter is used for active directory integrated zones.
<IPaddress> Lists the IP addresses of the servers that can perform the scavenge. If this parameter is omitted, all servers that host this zone can scavenge it.
Remarks

  • By default, all servers that host a zone can scavenge that zone.

  • If a zone is hosted on more than one DNS server, you can use this command to reduce the number of times a zone is scavenged.

  • Scavenging must be enabled on the DNS server and zone that is affected by this command.

Examples

dnscmd dnssvr1.contoso.com /zoneresetscavengeservers test.contoso.com 10.0.0.1 10.0.0.2

dnscmd /zoneresetsecondaries command

Specifies a list of IP addresses of secondary servers to which a primary server responds when it's asked for a zone transfer.

Syntax

dnscmd [<servername>] /zoneresetsecondaries <zonename> {/noxfr | /nonsecure | /securens | /securelist <securityIPaddresses>} {/nonotify | /notify | /notifylist <notifyIPaddresses>}

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<zonename> Specifies the name of the zone that will have its secondary servers reset.
/local Sets a local master list. This parameter is used for active directory integrated zones.
/noxfr Specifies that no zone transfers are allowed.
/nonsecure Specifies that all zone transfer requests are granted.
/securens Specifies that only the server that is listed in the name server (NS) resource record for the zone is granted a transfer.
/securelist Specifies that zone transfers are granted only to the list of servers. This parameter must be followed by an IP address or addresses that the primary server uses.
<securityIPaddresses> Lists the IP addresses that receive zone transfers from the primary server. This parameter is used only with the /securelist parameter.
/nonotify Specifies that no change notifications are sent to secondary servers.
/notify Specifies that change notifications are sent to all secondary servers.
/notifylist Specifies that change notifications are sent to only the list of servers. This command must be followed by an IP address or addresses that the primary server uses.
<notifyIPaddresses> Specifies the IP address or addresses of the secondary server or servers to which change notifications are sent. This list is used only with the /notifylist parameter.
Remarks
  • Use the zoneresetsecondaries command on the primary server to specify how it responds to zone transfer requests from secondary servers.

Examples

dnscmd dnssvr1.contoso.com /zoneresetsecondaries test.contoso.com /noxfr /nonotify
dnscmd dnssvr1.contoso.com /zoneresetsecondaries test.contoso.com /securelist 11.0.0.2

dnscmd /zoneresettype command

Changes the type of the zone.

Syntax

dnscmd [<servername>] /zoneresettype <zonename> <zonetype> [/overwrite_mem | /overwrite_ds]

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<zonename> Identifies the zone on which the type will be changed.
<zonetype> Specifies the type of zone to create. Each type has different required parameters, including:
  • /dsprimary - Creates an active directory integrated zone.
  • /primary /file <filename> - Creates a standard primary zone.
  • /secondary <masterIPaddress> [,<masterIPaddress>...] - Creates a standard secondary zone.
  • /stub <masterIPaddress>[,<masterIPaddress>...] /file <filename> - Creates a file-backed stub zone.
  • /dsstub <masterIPaddress>[,<masterIPaddress>...] - Creates an active directory integrated stub zone.
  • /forwarder <masterIPaddress[,<masterIPaddress>]... /file<filename> - Specifies that the created zone forwards unresolved queries to another DNS server.
  • /dsforwarder - Specifies that the created active directory integrated zone forwards unresolved queries to another DNS server.
/overwrite_mem Overwrites DNS data from data in AD DS.
/overwrite_ds Overwrites existing data in AD DS.
Remarks
  • Setting the zone type as /dsforwarder creates a zone that performs conditional forwarding.

Examples

dnscmd dnssvr1.contoso.com /zoneresettype test.contoso.com /primary /file test.contoso.com.dns
dnscmd dnssvr1.contoso.com /zoneresettype second.contoso.com /secondary 10.0.0.2

dnscmd /zoneresume command

Starts a specified zone that was previously paused.

Syntax

dnscmd [<servername>] /zoneresume <zonename>

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<zonename> Specifies the name of the zone to resume.
Remarks
  • You can use this operation to restart from the /zonepause operation.

Examples

dnscmd dnssvr1.contoso.com /zoneresume test.contoso.com

dnscmd /zoneupdatefromds command

Updates the specified active directory integrated zone from AD DS.

Syntax

dnscmd [<servername>] /zoneupdatefromds <zonename>

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<zonename> Specifies the name of the zone to update.
Remarks
  • Active directory integrated zones perform this update by default every five minutes. To change this parameter, use the dnscmd config dspollinginterval command.

Examples

dnscmd dnssvr1.contoso.com /zoneupdatefromds

dnscmd /zonewriteback command

Checks DNS server memory for changes that are relevant to a specified zone, and writes them to persistent storage.

Syntax

dnscmd [<servername>] /zonewriteback <zonename>

Parameters

Parameters Description
<servername> Specifies the DNS server to manage, represented by IP address, FQDN, or host name. If this parameter is omitted, the local server is used.
<zonename> Specifies the name of the zone to update.
Remarks
  • This is a zone-level operation. You can update all zones on a DNS server by using the /writebackfiles operation.

Examples

dnscmd dnssvr1.contoso.com /zonewriteback test.contoso.com