ID #1053

How can I know what ports are blocked by my ISP?

A.   In order to run a web server or email, you need to make sure your ports are open. If they are closed, then you may have to use different port numbers for your website. The best way to know what ports are blocked is to contact your ISP. Or these tools will scan your ports and let you know if your ports are open or closed. Try the following websites:
  • Good scanner, tests most ports, can submit your own port number to test.
  • Sygate Online Services-Good scanner.
  • Shields Up-Good, but no longer tests port 80.
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