2012-05-11 13:22

The server hosting this blog respond on all ipv4 TCP ports from 1 to 65535.

See: http://portquiz.net

The following URLs should also work if you are not filtered :

This allows you to test what TCP ports are filtered by your local network.

Command line example with netcat:

$ nc -v portquiz.net 1
Connection to portquiz.net 1 port [tcp/http-alt] succeeded!

$ nc -v -w2 portquiz.net 65535
nc: connect to portquiz.net port 65535 (tcp) timed out: Operation now in progress
2012-05-11 13:22 · Tags:


  1. Now that’s exactly what I was looking for.
    Thanks a bunch, mate!
    Cheers from Brazil.


  2. gr8 man,
    this service is wonderful..
    i was looking for this for long time
    Thanks :)


  3. Thanks a lot man.
    This really saved me a lot of time!


  4. Excellent. Thank you for giving us this valuable testing tool. Now i can verify they me Network Firewall guys are in deed blocking all the outgoing ports they claim they are blocking.


  5. Ports like 53 and 22 do not do the job


    • Yes they are! But you have to use netcat or telnet command to test them.

      See, on http://portquiz.net page :

      Your browser can block network ports normally used for purposes other than Web browsing. In this case you should use the telnet or netcat commands to test the port.

      Please also note that this server uses some port for real services (22, 25), so testing with your browser on those ports will not work.


  6. Excellent service!


  7. Thanks a lot for the site. I feel bad for checking all my ports but I really needed to know.

    You should add a donate link so I can thank you for your awesome service.


  8. Port 445 is blocked on portquiz? why? :D it was just the one i needed to test :/
    tried telnet and browser.. no go


    • I think that the hosting company, OVH is blocking this port. I tried to ask them but got no response. Sorry about that.


  9. Engine Feeder


  10. Thanks a lot, I was looking everywhere and there are no outgoing testers and Telnet is hardly ever on a system anymore.

    Much appreciated!!


  11. Ben Bennett

    Would it be possible for a US based company to host this function?
    It would be a very useful tool for users who are trying to utilize VoIP for calling (both at home and work, where firewalls come into play)


Leave a Reply to dooblem Cancel reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>