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An Internet registry (IR) is an entity that assigns and manages Internet numbers assigned to IT systems, autonomous systems and/or organizations.
Internet registry-based Internet and autonomous numbers are managed by the Internet Assigned Number Authority (IANA) and Internet Corporation of Assigned Names and Numbers (ICANN).
An Internet registry is primarily responsible for allocating and assigning IP numbers to devices, websites, information systems, autonomous systems and more. There are two different types of Internet registries: regional and local.
Each region maintains its regional Internet registry (RIR) that allocates IP numbers and autonomous systems within its region or to the local Internet registry. A local Internet registry generally is an Internet service provider (ISP) that has been authorized by the RIR to assign Internet numbers to its local businesses/organizations.