How IP addresses get distributed
This chart illustrates the way Internet Protocol address numbers are distributed by gatekeepers such as the Internet Corporation for Assigned Names and Numbers.
Chain of power Below are the organizations responsible for distributing IP address numbers. Internet Corporation for Assigned Names and Numbers (ICANN) Regional Internet Registries (RIR) | ||
American Registry for Internet Numbers (ARIN) Hands out number blocks to thousands of major ISPs such as WorldCom, UUNet, Sprint, and other large users of IP addresses, such as corporations and colleges. Many of ARIN's customers then pass the numbers on to smaller ISPs or end users. | Réseaux IP Européens (RIPE) This registry allocates IP numbers for all of Europe and gives out number blocks to any ISP no matter the size. | Asia Pacific Network Information Centre (APNIC) Like ARIN it encourages smaller ISPs to go upstream and get IP numbers from bigger providers. Large members include: Japan and Korea Network Information Centers, China Telecom, and China Education and Research Network. |
Sources: ARIN, ICANN, Tony Rutkowski |