Port Checker

Free online Port Checker. No sign-up needed, and it runs in your browser.

Check if a port is open on a server, as seen from the internet.

The check runs from the SAA Tool server on Cloudflare's network, not from your computer — so it shows what the internet sees. Port 25 (email) and private addresses such as 192.168.x.x can't be checked.

How to use

  1. Add your text or file.
  2. Adjust the options if needed.
  3. Copy or download the result.

Guides