Rizon is a large Internet Relay Chat (IRC) network with an average of around 20,000 users. The network itself ranks number 5 among the largest IRC networks. Rizon is popular with many anime fansubbing groups who work online, many of whom provide their content through XDCC via IRC bots in their distribution channels. It is also used by many users of eRepublik as a means of communication. File sharing of other copyrighted material such as Warez is also common in some channels on the network.
Rizon currently uses Plexus IRCd. Plexus was coded specifically with Rizon in mind and is based on Hybrid IRCd. Plexus is not exclusive to Rizon as the IRCd is also used by other networks. Plexus versions 1.x and 2.x were originally coded by static & peer. Plexus 3.x was rewritten by ThaPrince and is now maintained and developed by the Rizon Dev Team.
As of the r524 release, the ability for automatic services authentication using SSL client certificates has been implemented, and was largely based on the work done by OFTC, though significant changes were made regarding server-to-server communication.