Port Checker
To check if a port is open, enter a host and port (or pick a common one such as 22, 80, 443, 3389 or 25565): ClickZM's server tries a TCP connection and reports open, closed or filtered, with the response time and any service banner.
- Free
- No signup
- Live check from our server
How to use Port Checker
- 1Enter the website address, domain or IP you want to check.
- 2Click the button to run the Port Checker.
- 3Read the results; warnings and errors are highlighted with an explanation.
- 4Fix any issue, then run the check again to confirm.
Port Checker: questions people ask
Why does my port show closed?
No service is listening, the router is not forwarding it, or a firewall rejects it. 'Filtered' means the connection attempt timed out.
Can I scan many ports?
This tool checks one port at a time to prevent abuse; private and local addresses are blocked.
How does the Port Checker work?
Browsers cannot open raw network connections or read other websites directly, so ClickZM's server performs the check and returns the result. It blocks private and local addresses and does not store what you look up.
Is the Port Checker free?
Yes. The Port Checker is free with no signup, no watermark and no daily limit.