The '''American Registry for Internet Numbers''' ('''ARIN''') is the [[Regional Internet Registry]] (RIR) for [[Canada]], the [[United States]], and many [[Caribbean]] and [[North Atlantic]] islands. ARIN manages the distribution of Internet number resources, including [[IPv4]] and [[IPv6]] address space and [[Autonomous system (Internet)|AS numbers]]. ARIN opened its doors for business on December 22, 1997<ref>[https://www.arin.net/about_us/history.html About ARIN]</ref> after incorporating on April 18, 1997.<ref>[https://www.arin.net/about_us/corp_docs/artic_incorp.html Articles of Incorporation ]</ref> ARIN is a nonprofit corporation with headquarters in [[Chantilly, Virginia]], United States.<ref>"[https://www.arin.net/contact_us.html Contact Us]." American Registry for Internet Numbers. Retrieved on September 16, 2009.</ref><ref>"[http://factfinder.census.gov/servlet/MapItDrawServlet?geo_id=16000US5114744&_bucket_id=50&tree_id=420&context=saff&_lang=en&_sse=on Chantilly CDP, Virginia] {{webarchive|url=https://web.archive.org/web/20090628065130/http://factfinder.census.gov/servlet/MapItDrawServlet?geo_id=16000US5114744&_bucket_id=50&tree_id=420&context=saff&_lang=en&_sse=on |date=2009-06-28 }}." [[U.S. Census Bureau]]''. Retrieved on September 16, 2009.</ref>
ARIN is one of five [[Regional Internet registry|Regional Internet Registries]] (RIRs) in the world. Like the other RIRs, ARIN:
