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Access to this page requires authorization. You can try changing directories.
Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2
HKLM\SYSTEM\CurrentControlSet\Services\DNS\Parameters
| Data type | Range | Default value |
|---|---|---|
REG_DWORD |
0 | 1 |
0 |
Description
Enables and disables automatic reverse zones, an optimizing feature of the Domain Name System (DNS). When this feature is enabled, DNS automatically creates three reverse lookup zones.
Reverse lookup zones enable the DNS server to be authoritative, that is, to know the answer in advance and to respond immediately to the most common name queries, thus eliminating unnecessary recursive queries. In accordance with pertinent Requests for Comments (RFCs), by default, the DNS server is authoritative for three reverse lookup zones:
0.in-addr.arpa (0.0.0.0)
127.in-addr.arpa (127.0.0.1 - loopback)
255.in-addr.arpa (255. 255. 255. 255 - broadcast)
| Value | Meaning |
|---|---|
0 |
The automatic reverse zones feature is enabled. The DNS server automatically creates three reverse lookup zones. |
1 |
The automatic reverse zones feature is disabled. The DNS server does not automatically create reverse lookup zones. |
Change Method
If Microsoft Product Support Services instructs you to change the value of this entry, use Dnscmd.exe, a tool included in the Windows Support Tools, and then restart the DNS server.
Activation Method
Because the DNS server creates zones only when it starts, you must restart the DNS server to make changes to this entry effective, even if you use Dnscmd.exe to make the change.
Note
- DNS does not add this entry to the registry. You can add it by using the registry editor Regedit.exe, or by using a program that stores changes in the registry, such as Dnscmd.exe.
Caution
- Do not change the value of this entry unless instructed to by Microsoft Product Support Services. Using automatic reverse zones improves the performance of the DNS server. The default value is optimal for almost all DNS server configurations.