Port Scanner Tool

Scan open TCP ports on any host or IP address. View port status and common service names.

Responsible Use

Only scan hosts you own or have explicit permission to scan. Unauthorized port scanning may be illegal in your jurisdiction.

Hostname or IP Address

Port Scanner Tool

A port scanner probes a server or host for open TCP ports. Each port corresponds to a network service — for example, port 80 is HTTP, port 443 is HTTPS, and port 22 is SSH. Knowing which ports are open helps with network security auditing, server configuration verification, and firewall testing.

Common Port Numbers

21: FTP — File Transfer Protocol
22: SSH — Secure Shell
80/443: HTTP/HTTPS — Web traffic
3306: MySQL database
3389: RDP — Windows Remote Desktop

Open vs Closed Ports

An open port means a service is actively listening for connections. A closed port means no service is running, or a firewall is blocking the connection. Unexpected open ports can be a security risk.

Common Port Numbers

21: FTP — File Transfer Protocol
22: SSH — Secure Shell
80/443: HTTP/HTTPS — Web traffic
3306: MySQL database
3389: RDP — Windows Remote Desktop