Port 88
kerberos · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | kerberos |
| Reference | RFC 4120 |
| Modified | 2022-02-18 |
Frequently asked questions
What is port 88 used for?
Port 88 is registered with the IANA for kerberos (TCP/UDP). Description: Kerberos.
Is port 88 a well-known port?
Yes. Port 88 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 88 is open?
Locally on Linux with ss -tulpn | grep ':88\b', on Windows with netstat -ano | findstr :88. To test a remote host use Test-NetConnection <host> -Port 88 in PowerShell or nc -zv <host> 88 on Linux/macOS.
How do I open port 88 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 88/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=88/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 88" -Direction Inbound -Protocol TCP -LocalPort 88 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | kerberos | Kerberos |
| UDP | kerberos | Kerberos |