With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swL2IGMPMacAddr
Switch L2 IGMP Mac Address
1.3.6.1.4.1.171.11.70.5.2.11.5.1.3
This object is identify mac address which is corresponding to swL2IGMPGroupIpAddr, in per-Vlan basis.
Back to DES3018-L2MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor swL2IGMPMacAddr 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 routers right now.