With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
tn3270eSrvrPortAddress
tn3270e Srvr Port Address
1.3.6.1.2.1.34.8.1.2.1.3
A local address on the host that a TN3270E server resides on that is associated with a TCP port that is to be used or is in use by a TN3270E server. tn3270eClientGroupAddrType indicates the address type (IPv4 or IPv6, for example). A zero-length octet string SHALL be used as the value of this object when a local address isn't being specified.
Back to TN3270E-MIB MIB page.
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