Port 6443

sun-sr-https · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicesun-sr-https
Registered2006-03

Frequently asked questions

What is port 6443 used for?

Port 6443 is registered with the IANA for sun-sr-https (TCP/UDP). Description: Service Registry Default HTTPS Domain.

Is port 6443 a well-known port?

No. Port 6443 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 6443 is open?

Locally on Linux with ss -tulpn | grep ':6443\b', on Windows with netstat -ano | findstr :6443. To test a remote host use Test-NetConnection <host> -Port 6443 in PowerShell or nc -zv <host> 6443 on Linux/macOS.

How do I open port 6443 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 6443/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=6443/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 6443" -Direction Inbound -Protocol TCP -LocalPort 6443 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPsun-sr-httpsService Registry Default HTTPS Domain
UDPsun-sr-httpsService Registry Default HTTPS Domain

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