With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
alpsX121ToIpTransEntry
Cisco's Airline protocol support X121 To Ip Trans Entry
1.3.6.1.4.1.9.9.95.1.6.2.1
A mapping table between X.121 address and IP address.
Back to CISCO-ALPS-MIB MIB page.
IPHost Network monitor allows you to monitor alpsX121ToIpTransEntry on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.