Today, IP addresses are assigned by three not-for-profit organizations: the American Registry for Internet Numbers (ARIN), the Reséaux IP Européens (RIPE), and the Asia-Pacific Network Information Center (APNIC). These registries assign and manage IP addresses for various parts of the world: ARIN for North America, South America, the Caribbean, and sub-Saharan Africa; RIPE for Europe, the Middle East, and the rest of Africa; and APNIC for countries in the Asia-Pacific area. These organizations took over IP address management tasks from the Internet Assigned Numbers Authority (IANA), which performed them under contract with the U.S. government when the Internet was an experimentalresearch project.
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