DevOps & Containers

Port 6443

Kubernetes

Kubernetes API server — central cluster control plane

Port
6443
Protocol
TCP
Service
Kubernetes
Security
Restricted
Full name: Kubernetes API Server

What is port 6443?

Port 6443 is the default HTTPS port for the Kubernetes API server, the central control plane of a Kubernetes cluster. All kubectl commands and cluster components communicate through this port to manage deployments, scaling, configuration, and monitoring. It must be accessible only from authorized administrator IPs or through a VPN — several high-profile incidents have involved exposed Kubernetes API servers.

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