With IPHost Network Monitor you can run simple snmp requests against a IBM device in your network.
ibmMvsTcpConnTargetAppl
ibm Mvs Tcp Connection Target Appl
When the corresponding TCP connection is for a 3172 Telnet session then this object contains the Target VTAM Application name.
Back to ibm_mainframe-Mvstcpip MIB page.
IPHost Network monitor allows you to monitor ibmMvsTcpConnTargetAppl on IBM device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring IBM switches right now.