With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
natAddrBindNumberOfEntries
nat Addr Bind Number Of Entries
1.3.6.1.2.1.123.1.5
This object maintains a count of the number of entries that currently exist in the natAddrBindTable.
Back to NAT-MIB MIB page.
IPHost Network monitor allows you to monitor natAddrBindNumberOfEntries on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.