With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
dvmrpInterfaceRemoteSubnetMask
dvmrp Interface Remote Subnet Mask
1.3.6.1.3.62.1.1.3.1.6
The subnet mask for a directly connected subnet. For a tunnel, this should be 0.0.0.0. This object is deprecated in favor of address information associated with the underlying ifEntry.
Back to DVMRP-MIB MIB page.
IPHost Network monitor allows you to monitor dvmrpInterfaceRemoteSubnetMask on D-Link device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring D-Link WiFi routers right now.