Free Port Checker Tool
Check if specific ports are open on any server. Test firewall configuration and service availability.
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Common Port Reference
| Port | Service | Description |
|---|---|---|
| 21 | FTP | File Transfer Protocol |
| 22 | SSH | Secure Shell |
| 25 | SMTP | Email sending |
| 80 | HTTP | Web traffic (unencrypted) |
| 443 | HTTPS | Web traffic (encrypted) |
| 3306 | MySQL | MySQL Database |
| 3389 | RDP | Windows Remote Desktop |
| 5432 | PostgreSQL | PostgreSQL Database |