Port Scanner
Check which ports are open on your network
This tool scans YOUR connection's public IP for open ports. Only use this for security testing on networks you own or have permission to test.
Common Ports
Click a port to check or scan all common ports
Frequently Asked Questions
What is port scanning?
Port scanning checks which network ports on a server are open and accepting connections. It helps identify running services and potential security vulnerabilities.
Is port scanning legal?
Scanning your own servers is legal. Scanning others' servers without permission may violate laws in some jurisdictions. Always get authorization before scanning third-party systems.
What are the most common open ports?
Common ports include 80 (HTTP), 443 (HTTPS), 22 (SSH), 21 (FTP), 25 (SMTP), 53 (DNS), 3306 (MySQL), and 3389 (RDP).
What is the difference between an open port and a listening port?
A listening port has a service actively waiting for connections. An open port allows inbound traffic through the firewall. A port can be open at the firewall but have no service listening on it.
Which ports should I close to secure my server?
Close all ports not actively in use. Common ports to restrict include 23 (Telnet), 3389 (RDP), 3306 (MySQL), and 5432 (PostgreSQL). Only expose ports needed for your services, behind a firewall.
About Port Scanning
This browser-based port scanner works by attempting to establish WebSocket connections to common ports on your public IP address. Due to browser security restrictions, results may not be as comprehensive as dedicated network tools.
An "open" result means the port responded, while "closed" means no response was detected within the timeout period.
Common Ports Reference
| Port | Service | Description |
|---|---|---|
| 21 | FTP | File Transfer Protocol |
| 22 | SSH | Secure Shell |
| 80 | HTTP | Web Traffic |
| 443 | HTTPS | Secure Web Traffic |
| 3306 | MySQL | MySQL Database |
| 3389 | RDP | Remote Desktop |
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