ISO transport class 0; the standard TPKT/TP0-over-TCP port is 102, not this one.
IANA registers 146 as iso-tp0 (ISO-IP0), part of the family of registrations for running OSI transport over TCP/IP. The one that mattered is port 102, where RFC 1006 puts TPKT and TP0 — the encapsulation that ISO session-layer protocols, and later Siemens S7 industrial gear, actually use. Port 146 carries no deployed implementation. Treat it as a registry artifact and look at 102 if you are chasing real ISO-over-TCP traffic.
Expose with care
Nothing standard listens here; if something does, fingerprint it — and check whether the OSI service you actually care about is on 102.
$ nc -vz TARGET 146Seen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.