(A space-delimited list of dotted decimal subnet masks.)
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, it overrides the value of DhcpSubnetMask .