Online Port Scanner
Check if ports are open or closed on any server. Test port availability and detect running services instantly.
Common ports:
How it works:
Enter a server address and port number. We’ll attempt to connect and tell you if the port is open (accepting connections) or closed (blocked/refused).
Common Port Numbers Reference
| Port | Service | Protocol | Description |
|---|---|---|---|
| 20, 21 | FTP | TCP | File Transfer Protocol (data and control) |
| 22 | SSH | TCP | Secure Shell – remote administration |
| 25 | SMTP | TCP | Simple Mail Transfer Protocol |
| 53 | DNS | TCP/UDP | Domain Name System |
| 80 | HTTP | TCP | HyperText Transfer Protocol (web) |
| 443 | HTTPS | TCP | Secure HTTP (SSL/TLS encrypted web) |
| 3306 | MySQL | TCP | MySQL Database Server |
| 8080 | HTTP Alt | TCP | Alternative HTTP port (proxies, dev servers) |
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