Source : Free On-Line Dictionary of Computing

Undernet
     
         An {Internet Relay Chat} network dating from the
        1990s, when it broke away from the main (still larger) IRC
        network, {EFNet}.
     
        {Home (http://www.undernet.org/)}.
     
        {The History of the Undernet
        (http://www2.undernet.org:8080/~cs93jtl/unet_history.txt)}.
     
        (1995-11-09)