With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
tn3270sIpEntry
tn3270s Ip Entry
1.3.6.1.4.1.9.9.54.1.4.1.1
A list of entries to relate a client IP address to the LU
Back to CISCO-TN3270SERVER-MIB MIB page.
IPHost Network monitor allows you to monitor tn3270sIpEntry on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco mobile switches right now.