DNS & Network tools · FREE
Which ports are open?
Enter a domain or IP to see which common server ports are open or closed.
About this tool
A port scan shows which services on your server are reachable from outside. An open port means a service is listening on it (e.g. 443 for HTTPS). Unnecessary open ports increase your attack surface — this tool checks the common ports so you can confirm your server is secure.
Frequently asked questions
What does a port scan do?
It checks which TCP ports on a server are open and reachable from the outside.
Which ports are checked?
Common ports like SSH(22), HTTP(80), HTTPS(443), FTP(21), email and database ports.
Is port scanning legal?
Scanning your own server is perfectly fine; use it for troubleshooting and security checks.
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