With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
atmfNetPrefixTable
Cisco ATM Forum Net Prefix Table
1.3.6.1.4.1.353.2.7.1
A table implemented by the user-side IME, containing the network-prefix(es) for ATM-layer addresses in effect on the user side of the UNI.
Back to ATM-FORUM-ADDR-REG MIB page.
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