With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cssgStatsActiveHosts
cssg Stats Active Hosts
1.3.6.1.4.1.9.9.260.1.2.4
The current number of active Hosts on SSG.
Back to CISCO-SSG-MIB MIB page.
IPHost Network monitor allows you to monitor cssgStatsActiveHosts 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.