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Top-level domain

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A host address on the Internet is divided into a group of names, separated by periods. The last of these domains is called a Top level domain, or TLD. There is an enormous number of these, including one for each country. A partial list is below. 



Unrestricted:
  • ".com" -- Originally for commercial companies
  • ".net" -- Originally for network infrastructure
  • ".org" -- Originally for non-profit organizations
  • ".arpa" -- ARPA net addresses; presently used for reverse lookup by IP address
  • ".uucp" -- A virtual domain for computers that are indirectly connected through UUCP.
  • ".bitnet" -- A virtual domain for DEC Bitnet machines to be referenced from the Internet.
  • ".k12" -- Elementary, Grammar and High Schools.


Restricted:
  • ".mil" -- The U.S. Military
  • ".gov" -- The U.S. Government
  • ".edu" -- Educational institutions in the U.S.
  • ".int" -- International


Proposed:
  • ".info" -- Informational
  • ".biz" -- Business
  • ".coop" -- Cooperatives


Country codes (aka CCTLD's) include "AD" for Andorra and are listed here.


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