Why is port checking server-side?

Browsers cannot make raw TCP connections; port scanning requires a server.

A port is a virtual endpoint for network communication on a host.

What ports can I check?

Any valid TCP port from 1 to 65535.

online

Port Checker — online

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 Host

Type the hostname or IP address to check.

Enter Port

Enter the port number you want to check.

View Result

See if the port is open or closed.

Frequently Asked Questions

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