The History of the Internet Corporation for Assigned Names and Numbers (ICANN) (English)
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John Kneuer explains the transition between ICANN and IANA
The Internet Assigned Numbers Authority (IANA) is a function of ICANN, a nonprofit private American corporation that oversees global IP address allocation, autonomous system number allocation, root zone management in the Domain Name System (DNS), media types, and other Internet Protocol-related symbols and Internet numbers.