Free Port Checker
Enter a host and port. We try a real TCP connection and tell you if the port is open.
Common proxy ports to try: 8080, 3128, 8888, 1080 (SOCKS), 80, 443.
What is a port?
Every internet address has 65,535 ports, numbered doors that different services listen on. Web traffic usually uses port 80 (HTTP) or 443 (HTTPS), proxy servers often use 8080 or 3128, and SOCKS proxies commonly use 1080. When a port is open, something is listening there and answering. When it is closed, connection attempts are refused or ignored.
How to use the port checker
- Enter the IP address or domain name of the server.
- Enter the port number (1 to 65535).
- Press Check port. A real TCP connection is attempted from our server and you get the result in seconds.
Why check a port?
Proxy users check ports to confirm a proxy server is actually listening before configuring it. Developers check ports after opening firewall rules. Gamers and self-hosters check ports to see if their server is reachable from the internet. Whatever the reason, an open port means the service is up and reachable.
Frequently asked questions
Is the port checker free?
Yes, free with no signup.
What does it mean if a port is closed?
Either nothing is listening on that port, or a firewall is blocking the connection. Both look the same from the outside.
Can I scan many ports at once?
This tool checks one port per run to keep it fast and abuse-free. Check the ports you care about one by one.
Why are private IPs blocked?
The check runs from our server, which cannot reach your home network addresses like 192.168.x.x anyway. Only public hosts can be tested.