Undernet definitions

(1) See deep Web.
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Dates back to the 1990s when an IRC (Internet Relay Chat) network separated from the main IRC network. At present, the undernet is one of the largest real-time chat networks in the world, with about 41 servers connecting more than 13 countries and serving more than 100,000 clients at any time. Undernet.org. Undernet. [Online, April 11, 2006.] Undernet.org Website. http://www.undernet.org/.
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The criminal underworld in cyberspace.
noun
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Origin of undernet

under- +"Ž net, perhaps modelled on underworld.