With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cDot11ActiveDevicesTable
Cisco Dot11 Active Devices Table
1.3.6.1.4.1.9.9.273.1.1.2
This table contains the list of active devices currently associated with this device on each of the IEEE 802.11 interfaces. This table has a sparse dependent relationship on the ifTable.
Back to CISCO-DOT11-ASSOCIATION-MIB MIB page.
IPHost Network monitor allows you to monitor cDot11ActiveDevicesTable on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.