With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
bsnAPNetmask
bsn AP Netmask
1.3.6.1.4.1.14179.2.2.1.1.26
The Netmask of the IP address of the AP.
Back to AIRESPACE-WIRELESS-MIB MIB page.
IPHost Network monitor allows you to monitor bsnAPNetmask on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.