With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cIpAddressEntry
Cisco Ip Address Entry
1.3.6.1.4.1.9.10.86.1.1.2.1
Inet addr entry.
Back to CISCO-IETF-IP-MIB MIB page.
IPHost Network monitor allows you to monitor cIpAddressEntry 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.