With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swMacBasedAuthInfoAssignVLANName
sw Mac Based Authorization Info Assign VLAN Name
This object indicates the VLAN name that the port is assigned to once MAC authentication was successful.
Back to Mac-Based-Authentication-MIB MIB page.
IPHost Network monitor allows you to monitor swMacBasedAuthInfoAssignVLANName 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.