With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
mpcEgressCachePrefixLen
mpc Egress Cache Prefix Len
1.3.6.1.4.1.353.5.8.1.1.2.15.1.4
Defines an equivalence class of addresses that match Prefix Length bit positions of the destination internetwork layer address.
Back to MPOA-MIB MIB page.
IPHost Network monitor allows you to monitor mpcEgressCachePrefixLen 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.