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HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\ interface-name

Data type


Default value


0 | 1



Determines whether the IP autoconfiguration feature is enabled for this interface.

Autoconfiguration allows TCP/IP to configure an interface even when it cannot locate a Dynamic Host Configuration Protocol (DHCP) server. If TCP/IP cannot locate DCHP server, it configures the interface by using IP addresses from the Microsoft reserved Class B network (, subnet mask During autoconfiguration, TCP/IP continues trying to locate a DHCP server, and it abandons autoconfiguration if it finds one.

IPAutoconfigurationEnabled also appears in the Parameters subkey, and its value applies, by default, to all interfaces. However, if this entry appears in any subkey of the Interfaces subkey, it takes precedence over the entry in the Parameters subkey when configuring the interface.

Note Image Note

Windows 2000 does not add this entry to the registry. You can add it by editing the registry or by using a program that edits the registry.

Caution Image Caution

Do not change the value of this entry. If you do, the IP address assigned to the interface might not be reliable.