TCP 89
Synopsis
- IANA registers TCP port 89 for su-mit-tg (SU/MIT Telnet Gateway), an old Telnet gateway service historically deployed at universities; it is largely obsolete today and rarely seen on modern networks.
- No widely adopted contemporary software listens on TCP 89 by default.
- Note: OSPF is often confused here—it uses IP protocol number 89, not TCP port 89.
Observed activity
Last 30 days
Detailed chart