With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cdpCtAddress
Cisco Discovery Protocol Ct Address
1.3.6.1.4.1.9.9.23.1.2.2.1.5
The N-th network-layer address of the device as reported in the most recent CDP message's Address TLV, where N-1 is given by the value of cdpCtAddressIndex. For example, if the the corresponding instance of cdpCtAddressType had the value 'ip(1)', then this object would be an IPv4-address. NOTE - The 1st address received in the Address TLV is available using cdpCacheAddress
Back to CISCO-CDP-MIB MIB page.
IPHost Network monitor allows you to monitor cdpCtAddress 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.