Port 6443 — Kubernetes API

TCP · Port 6443/TCP is used for the Kubernetes API, which provides a RESTful interface for managing and interacting with Kubernetes clusters. This port is critical for cluster management and security, as it allows administrators to create, update, and delete resources such as pods, services, and deployments.

Port Number: 6443
Service Name: Kubernetes API
Protocol: TCP
Common Software: kube-apiserver

Security Notes

Review IANA registry for port 6443 usage. Apply principle of least privilege - only open ports that are required.

FAQ

What is port 6443 used for?

Port 6443 is used for Kubernetes API. Port 6443/TCP is used for the Kubernetes API, which provides a RESTful interface for managing and interacting with Kubernetes clusters. This port is critical for cluster management and security, as it allows administrators to create, update, and delete resources such as pods, services, and deployments. Common software: kube-apiserver.

Is port 6443 dangerous to leave open?

Review IANA registry for port 6443 usage. Apply principle of least privilege - only open ports that are required.

How do I check if port 6443 is open?

Use nmap: nmap -p 6443 <target> or check locally: ss -tlnp | rg 6443