Curated port reference

Port 88: Kerberos

Kerberos commonly uses port 88 over TCP + UDP. Review its purpose, traffic direction and operational security considerations.

88TCP + UDP

Kerberos

Kerberos authentication and ticket exchange.

Typical use

Active Directory domain authentication and other Kerberos realms; clients may fall back to TCP for larger exchanges.

Traffic direction

Client to server

Security considerations

Both transports may be required. Time synchronization, DNS and key distribution centre availability are operational dependencies.