cDhcpv4ServerClientSubnetMask 1.3.6.1.4.1.9.10.102.1.4.4.1.2

The subnet mask (DHCP option 1) provided to the client offered this address. The subnet, resulting from logically ANDing the subnet mask with the entry's IPv4 address, MUST be configured on this server and appear as a row in the cDhcpSubnetTable.