With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cgkHistoryEventEndpointAddress
Cisco Gatekeeper History Event Endpoint Address
1.3.6.1.4.1.9.10.40.1.2.2.1.7
The network address associated with the endpoint that triggered the register or unregister event. This field is not valid for other event types.
Back to CISCO-GATEKEEPER-MIB MIB page.
IPHost Network monitor allows you to monitor cgkHistoryEventEndpointAddress on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.