Is Port Checker free to use?

Yes, completely free. No registration, login, or credit card required. You can check unlimited ports with no usage limits or restrictions.

How does Port Checker work?

Port Checker attempts a TCP connection to your specified host and port. If the connection succeeds within 10 seconds, the port is open; if rejected or times out, it's closed. Results display instantly.

What ports can I check?

You can check any port from 1 to 65535. Common ports include 80 (HTTP), 443 (HTTPS), 22 (SSH), 21 (FTP), 3306 (MySQL), 5432 (PostgreSQL), and 3389 (RDP).

Why does a port show as 'Timeout'?

A timeout means the server didn't respond within 10 seconds. This typically indicates the port is closed, blocked by a firewall, or the host is unreachable or offline.

Can I check ports on my own computer?

Yes. Use 'localhost' or '127.0.0.1' as the host to check ports on your local machine. You can also use your public IP address from tools like whatismyipaddress.com.

Is it legal to check if a port is open?

Yes, checking ports on your own devices and authorized systems is legal. Never scan ports on systems you don't own or have permission to test—this may violate laws like the Computer Fraud and Abuse Act.

Does Port Checker work on mobile devices?

Yes, Port Checker works on all devices including iPhone, iPad, Android phones, tablets, and desktop computers. The responsive design adapts to any screen size.

What's the difference between an open and closed port?

An open port actively listens for connections and has a service running. A closed port rejects connection attempts. Open ports indicate running services; closed ports indicate no active service or blocked access.

How long does a port check take?

Most checks complete in 1-3 seconds. The tool waits up to 10 seconds maximum before returning a timeout result. Response time varies based on network latency and host location.

Is my data safe using Port Checker?

Yes, completely safe. Port Checker only performs TCP connection attempts. No data is stored, logged, or sent to third parties. All checks are processed instantly and discarded.

free

Port Checker — free

Check if a port is open or closed on any host.

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Server-Side Tool

Port Checker requires making HTTP requests to external servers, which is blocked by browser security policies (CORS). This feature requires a server-side implementation.

Coming Soon

We are building a backend API to support this tool. Check back soon!

In the meantime, try these alternatives:

Use browser developer tools (F12 → Network tab)
Check online services like MXToolbox, Cloudflare Radar
Use curl or wget from your terminal

How to use Port Checker

Enter the hostname or IP address

Type the target hostname (e.g., example.com) or IP address (e.g., 192.168.1.1) into the 'Host' input field at the top of the form.

Input the port number to check

Enter the port number (1-65535) in the 'Port' field. Common ports: 80 (HTTP), 443 (HTTPS), 22 (SSH), 3306 (MySQL), 5432 (PostgreSQL).

Click the 'Check Port' button

Press the green 'Check Port' button to initiate the port scan. The tool will connect to the specified host and port within 10 seconds.

Review the results

The result box will display 'Open' (green), 'Closed' (red), or 'Timeout' (gray), along with response time in milliseconds and the connection status.

Frequently Asked Questions

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