What is a Port Checker?
A Port Checker is a free online tool that helps you test open ports on
your computer, server, or network device. It’s widely used by system administrators,
developers, and gamers to verify connectivity and troubleshoot firewall or NAT issues.
Why Use a Port Checker Tool?
- Network Troubleshooting: Quickly identify if a port is open or blocked.
- Server Configuration: Verify services like SSH, FTP, or MySQL are accessible.
- Security Testing: Check for unnecessary open ports that could be exploited.
- Gaming & Applications: Ensure required ports for multiplayer games or apps are open.
Commonly Checked Ports
| Port |
Service |
| 22 | SSH (Secure Shell) |
| 80 | HTTP (Web Traffic) |
| 443 | HTTPS (Secure Web Traffic) |
| 3306 | MySQL Database |
| 3389 | Remote Desktop (RDP) |
How to Use This Tool?
- Enter an IP address or domain name in the Host field.
- Enter one or multiple ports (comma-separated) in the Ports field.
- Click Check to see if the ports are open or closed.
- You can also export results as a CSV file for record-keeping.
Why PortCheckerTool.com?
At PortCheckerTool.com, we provide a simple yet powerful way to check ports
online. Our service is fast, free, and secure — perfect for both beginners and professionals.