Open Port Checker

Check if a specific port is open on a target server.

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Features

Instant Reachability Test

Verify if your server or computer is accessible from the public internet on a specific port.

Port Forwarding Verification

Confirm that your router is correctly forwarding traffic to your internal device for games, web servers, or cameras.

Firewall Diagnostics

Detect if your firewall or ISP is blocking specific ports that should be open.

Common Services Check

Quickly test standard ports for HTTP, FTP, SSH, SQL, and email services.

About Open Port Checker

The Open Port Checker is a fundamental network diagnostic tool used to determine if a specific communication channel (port) is open and accessible on a server or computer from the internet. Ports are virtual places where network connections start and end. For example, web servers typically listen on port 80 (HTTP) or 443 (HTTPS), while email servers use port 25 (SMTP). If a port is 'Open', it means the server is accepting connections. If it is 'Closed' or 'Filtered', a firewall or network configuration is blocking access. This tool attempts to establish a connection to your specified address and port to verify its status in real-time.

How to Use Open Port Checker

  • 1
    Enter Address

    Type the IP address or domain name (e.g., 'example.com') you want to test.

  • 2
    Select Port

    Enter the port number (e.g., 22 for SSH) or select one from the common ports list.

  • 3
    Check Status

    Click the 'Check Port Status' button to attempt a connection.

  • 4
    Analyze Result

    See if the port is 'Open' (Success) or 'Closed' (Connection Refused/Timeout).

Open Port Checker - Test Port Forwarding & Firewall | Free Tool