With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cpimExtNbrSecMask
cpim Ext Neighbor Sec Mask
1.3.6.1.4.1.9.10.120.1.1.3.1.2
The network mask for the Inet address presented in cpimExtNbrSecAddress
Back to CISCO-IETF-PIM-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cpimExtNbrSecMask 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.
