The Internet

 
 
 
 
 
 
 
 
 
 

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IP (Internet Protocol) Addresses
& Domain Names 
Domain name registries around the world  is a list showing the country extension, such as .au for australia with links to the location in each country that maintains the registry in that country.  AUNIC the Australian organization has some helpful information.
Internet Society is a non-profit, non-govenmental, international professional membership organization that beings diverse interests and factions together to hammer out reasonable solutions  and represents a veritable who's who of the Internet community - join a chapter near you -  read the History of the Internet
Internet Conduct - this looks good - follow the reference to Guidelines for Management of IP address Space.  Also, this seems to be part of an official site and should provide some other authoritative information. 
Ultimately the Internet is run by The Internet Engineering Task Force
Understanding IP Addressing: Everything You Ever Wanted To Know
by sombody who knows  :)