IANA

The Internet Assigned Numbers Authority (IANA) coordinates global allocation of internet number resources, root DNS, protocol parameters, and the tz time zone database. It operates under ICANN.

The Internet Assigned Numbers Authority (IANA) is the body responsible for the global coordination of unique identifiers and parameters used on the internet. Its mandate covers allocation of IP address blocks to regional registries, management of the DNS root zone and the .arpa and .int top-level domains, registries of protocol parameters specified by the IETF, and stewardship of the Why Timezone Rules Are So Complex (tzdata) since 2011. IANA's functions originated with Jon Postel at the University of Southern California's Information Sciences Institute and were transferred to ICANN under contract with the U.S. Department of Commerce, with the IANA stewardship transition in 2016 moving oversight to the global multistakeholder community.

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