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The Internet Corporation for Assigned Names and Numbers (ICANN {{#invoke:IPAc-en|main}} EYE-kan) is a nonprofit organization that is responsible for coordinating the maintenance and methodologies of several databases, with unique identifiers, related to the namespaces of the Internet - and thereby, ensuring the network's stable and secure operation.<ref name="ICANN Bylaws"/>

Most visibly, much of its work has concerned the Internet's global Domain Name System, including policy development for internationalization of the DNS system, introduction of new generic top-level domains (TLDs), and the operation of root name servers. The numbering facilities ICANN manages include the Internet Protocol address spaces for IPv4 and IPv6, and assignment of address blocks to regional Internet registries. ICANN also maintains registries of Internet protocol identifiers.

ICANN performs the actual technical maintenance work of the central Internet address pools and DNS Root registries pursuant to the IANA function contract.

ICANN's primary principles of operation have been described as helping preserve the operational stability of the Internet; to promote competition; to achieve broad representation of the global Internet community; and to develop policies appropriate to its mission through bottom-up, consensus-based processes.<ref name="Memorandum of understanding between the U.S. Department of Commerce and Internet Corporation for assigned names and numbers"/>

ICANN was created on September 18, 1998, and incorporated on September 30, 1998.<ref name="kepler.ss.ca.gov"/> It is headquartered in the Playa Vista section of Los Angeles, California. On September 29, 2006, ICANN signed a new agreement with the United States Department of Commerce (DOC) that moves the organization further towards a solely multistakeholder governance model.<ref name="doc"/>

On October 1, 2009 the U.S. Department of Commerce gave up its control of ICANN, completing ICANN's transition.<ref name=ZDNet2009>"US Government finally lets ICANN go", Eileen Yu, ZDNet, 30 September 2009.</ref>


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