With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cnatConfDynAddressMapType
cnat Config Dyn Address Map Type
1.3.6.1.4.1.9.10.77.1.1.3.1.2
Address (and Transport-ID) maps may be defined for both inbound and outbound direction. Outbound address map refers to mapping a selected set of addresses from private realm to a selected set of addresses in external realm; whereas inbound address map refers to mapping a set of addresses from the external realm to private realm.
Back to CISCO-IETF-NAT-MIB MIB page.
IPHost Network monitor allows you to monitor cnatConfDynAddressMapType 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.