Any reason im Network Banned

Hi when I try to join the irc server I get
*** Oops, you appear to have been network banned. Please contact us on the forums to appeal: http://www.spigotmc.org/
* Closing link: (unknown@*.*.*.*) [G-Lined: [#1526] Proxy, Ban evasion]

As far as i know I am not on a proxy or to my knowledge done anything wrong

Thanks JamieKG