|Data type||Range||Default value|
|REG_SZ||(A space-delimited list of dotted decimal subnet masks.)||(There is no default value for this entry. The value is configured by DHCP.)|
Specifies the subnet mask for the IP address specified in the value of IPAddress or DhcpIPAddress. This entry, which can be changed by the user, overrides the DHCP-configured values for the subnet mask.
The subnet mask is determined by two entries, DhcpSubnetMask, which is configured by DHCP, and SubnetMask, which you can configure. If the value of SubnetMask is not 0.0.0.0, then it overrides the value of DhcpSubnetMask.
The DHCP client service adds this entry to the registry when the service is enabled. It is maintained for internal use by the DHCP client service. Do not delete this entry or change its value.