Port 88 — Kerberos
Quick reference for TCP/UDP port 88, used by Kerberos. Includes what the service does, security guidance and related ports.
Port
88
Protocol
TCP/UDP
Service
Kerberos
What is port 88?
Kerberos authentication.
What port does Kerberos use?
Kerberos listens on port 88 by default.
Security guidance
Medium risk — open with care
Port 88 (Kerberos) can safely face the internet if you keep the software up to date, restrict admin endpoints, and use TLS where possible. Audit who can reach it and watch your logs.
Related ports
Frequently asked
What is port 88 used for?+
Port 88 is the standard TCP/UDP port for Kerberos. Kerberos authentication.
What port does Kerberos use?+
Kerberos listens on port 88 by default.
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