With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
natAddrPortBindEntry
nat Addr Port Bind Entry
1.3.6.1.2.1.123.1.8.1
Each entry in the this table holds information about a NAPT bind that is currently active. These entries are lost upon agent restart. This row has indexing which may create variables with more than 128 subidentifiers. Implementers of this table must be careful not to create entries which would result in OIDs that exceed the 128 subidentifier limit. Otherwise, the information cannot be accessed using SNMPv1, SNMPv2c or SNMPv3.
Back to NAT-MIB MIB page.
IPHost Network monitor allows you to monitor natAddrPortBindEntry on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.