With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swIGMPSnpDynamicRouterIpAddr
Switch IGMP SNOOPING Dynamic Router Ip Address
1.3.6.1.4.1.171.12.73.3.1.5.1.1
This indicates the IGMP snooping dynamic router IP in this VLAN.
Back to MCAST-SNOOPING-MIB MIB page.
IPHost Network monitor allows you to monitor swIGMPSnpDynamicRouterIpAddr 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 switches right now.