With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swL2IGMPGroupIpAddr
Switch L2 IGMP Group Ip Address
1.3.6.1.4.1.171.11.70.5.2.11.5.1.2
This object identifies group IP addresses which were captured from IGMP packets, on a per-VLAN basis.
Back to DGS3200-L2MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor swL2IGMPGroupIpAddr 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 access points right now.