With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cnatConfDynLocalPortFrom
cnat Config Dyn Local Port From
1.3.6.1.4.1.9.10.77.1.1.3.1.5
If this conceptual row describes a basic NAT, then the value of this object is '0'. If this conceptual row describes NAPT, then the value of this object specifies the first port number in the range of ports being mapped. If the translation specifies a single port, then the value of this object is equal to the value of cnatConfDynLocalPortTo.
Back to CISCO-IETF-NAT-MIB MIB page.
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