# Finding open UDP ports?

**URL:** <https://forum.kirupa.com/t/finding-open-udp-ports/218650>\
**Category:** Uncategorized\
**Created:** [March 9, 2007, 1:23pm UTC](https://forum.kirupa.com/t/finding-open-udp-ports/218650 "2007-03-09T13:23:59Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![danulf](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/danulf/32/555_2.png) [@danulf](https://forum.kirupa.com/u/danulf)\
**Post date:** [March 9, 2007, 1:23pm UTC](https://forum.kirupa.com/t/finding-open-udp-ports/218650/1 "2007-03-09T13:23:59Z")

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My school have blocked almost all ports to prevent us from using msn messenger, hamachi and stuff while in school. We’ve found a way to work around the msn-block though. We use msn 7.0, and set the connection to be made through a specific port. This doesn’t work in Hamachi though. My question now is: Is there a way to find open UDP ports? I have an open TCP port, at least I think I do, I don’t know any way of testing it.

I googled it and found a port scanning program, but it can’t find any UDP ports… Is it possible that they have all the UDP ports blocked? I wish I remembered anything from my network classes ☹