With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cnatSessionTransPrivateAddr
cnat Session Trans Private Address
1.3.6.1.4.1.9.10.77.1.2.5.1.7
The translated IP address of the session endpoint that lies in the private network. The value of this object is equal to that of the original public IP Address (cnatSessionOrigPrivateAddr) when there is no translation.
Back to CISCO-IETF-NAT-MIB MIB page.
IPHost Network monitor allows you to monitor cnatSessionTransPrivateAddr on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco mobile switches right now.