One of the largest and oldest Internet Relay Chat networks that loosely sprung up in 1992 and was formally launched in 1993. By 2005, the network was set up with over 40 servers handling more than a dozen countries and over 100,000 simultaneous users at any given time of day. In 2008, a million people each week in over 35 countries were connected using the service.

Its UnderCurrents newsletter covers news and events in the IRC world, and its Documents Project covers every kind of imaginable resource documentation. For information, visit www.undernet.org. See EFNet and IRC.