Port 6443 — Kubernetes API
Quick reference for TCP/UDP port 6443, used by Kubernetes API. Includes what the service does, security guidance and related ports.
What is port 6443?
Kubernetes API server.
What port does Kubernetes API use?
Kubernetes API listens on port 6443 by default.
Is port 6443 open? How to check
Run one of these from your computer, replacing HOST with the IP address or domain you want to test.
nc -zv HOST 6443
Test-NetConnection HOST -Port 6443
nmap -p 6443 HOST
A refused or timed-out connection means the port is closed or filtered by a firewall.
Security guidance
Medium risk — open with care
Port 6443 (Kubernetes API) 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 6443 used for?+
Port 6443 is the standard TCP/UDP port for Kubernetes API. Kubernetes API server.
What port does Kubernetes API use?+
Kubernetes API listens on port 6443 by default.
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