Port 89
su-mit-tg · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | su-mit-tg |
Frequently asked questions
What is port 89 used for?
Port 89 is registered with the IANA for su-mit-tg (TCP/UDP). Description: SU/MIT Telnet Gateway.
Is port 89 a well-known port?
Yes. Port 89 is in the range 0–1023 (system or well-known ports). On Linux and macOS only privileged processes may bind to these ports.
How do I check whether port 89 is open?
Locally on Linux with ss -tulpn | grep ':89\b', on Windows with netstat -ano | findstr :89. To test a remote host use Test-NetConnection <host> -Port 89 in PowerShell or nc -zv <host> 89 on Linux/macOS.
How do I open port 89 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 89/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=89/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 89" -Direction Inbound -Protocol TCP -LocalPort 89 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | su-mit-tg | SU/MIT Telnet Gateway |
| UDP | su-mit-tg | SU/MIT Telnet Gateway |