With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cdxCpeToCmInetAddressType
Cisco DOCSIS Cpe To Cable Modem Inet Address Type
1.3.6.1.4.1.9.9.116.1.3.9.1.3
The type of Internet address of the cdxCpeToCmInetAddress object.
Back to CISCO-DOCS-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cdxCpeToCmInetAddressType 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.