IANA is a department 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 numbers.
Users are assigned IP addresses by Internet service providers (ISPs). ISPs obtain allocations of IP addresses from a local Internet registry (LIR) or National Internet Registry (NIR), or from their appropriate Regional Internet Registry (RIR):
|ARIN||Canada, USA, and some Caribbean Islands|
|LACNIC||Latin America and some Caribbean Islands|
|RIPE NCC||Europe, the Middle East, and Central Asia|