Port
Port 88 — Kerberos
Port 88 (TCP/UDP) is used by Kerberos. Network authentication protocol used by Active Directory.
Port 88 at a glance
| Property | Value |
|---|---|
| Port number | 88 |
| Transport | TCP/UDP |
| Service | Kerberos |
| Category | Well-known port |
What it is used for
Network authentication protocol used by Active Directory.
Security considerations
Critical to protect — Kerberos attacks (Kerberoasting) target it.
See our full TCP/UDP port reference and learn how firewalls filter ports in the CyberOps course.
Frequently asked questions
What is port 88 used for?
Port 88 (TCP/UDP) is used by Kerberos. Network authentication protocol used by Active Directory.
Is port 88 TCP or UDP?
Port 88 uses TCP/UDP.
Is it safe to open port 88?
Critical to protect — Kerberos attacks (Kerberoasting) target it.
Related
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