Port checker
Checks whether a TCP port is open on your current public IP address — as seen from the internet. Useful for testing firewall rules, remote desktop access, game server visibility, and self-hosted services.
Common ports
80HTTP
—443HTTPS
—22SSH
—21FTP
—3389RDP
—8080HTTP-alt
—53DNS
—3306MySQL
—Check any port
What do the results mean?
Open
A service is actively listening on this port. From the internet, someone could attempt to connect to it.
Closed
Nothing is running on this port. The connection was refused immediately — normal for unused ports.
Filtered
A firewall is silently blocking this port. No response was received — common on home routers and ISP networks.