With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cnatAddrBindEntry
cnat Address Bind Entry
1.3.6.1.4.1.9.10.77.1.2.2.1
Each entry in the NAT BIND table holds information about a NAT BIND that is currently active.
Back to CISCO-IETF-NAT-MIB MIB page.
IPHost Network monitor allows you to monitor cnatAddrBindEntry on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.