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IANA study.
IANA, Organization
Updated Jan 10, 2015 by jht5...@gmail.com

The Internet Assigned Numbers Authority (IANA) is responsible for the global coordination of the DNS Root, IP addressing, and other Internet protocol resources.


Domain Name Services http://www.iana.org/domains IANA manages the DNS Root Zone (assignments of ccTLDs and gTLDs) along with other functions such as the .int and .arpa zones.
Number Resources http://www.iana.org/numbers IANA coordinates allocations from the global IP and AS number spaces, such as those made to Regional Internet Registries.
Protocol Registries http://www.iana.org/protocols IANA is the central repository for protocol name and number registries used in many Internet protocols.

Media Types http://www.iana.org/assignments/media-types/media-types.xhtml
Message Headers http://www.iana.org/assignments/message-headers/message-headers.xml
Character Sets http://www.iana.org/assignments/character-sets/character-sets.xml