With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swDHCPRelayVlanCtrlVlanRangeList449to512
Switch DHCP Relay Vlan Control Vlan Range List449to512
1.3.6.1.4.1.171.12.42.3.5.1.9
This object indicates the VLAN range (3585-4096) that added the specific server.
Back to DHCP-RELAY-MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor swDHCPRelayVlanCtrlVlanRangeList449to512 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.