With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cCasaAddressMask
Cisco Casa Address Mask
1.3.6.1.4.1.9.9.122.1.1.1.1.8
The operational IP subnet mask of the CASA feature. When cCasaState is set to casaEnabled, this object attains the value contained in cCasaCfgAddressMask. A get on this object when cCasaState is casaNotEnabled returns a noSuchObject exception.
Back to CISCO-CASA-MIB MIB page.
IPHost Network monitor allows you to monitor cCasaAddressMask 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.
