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We are responsible for global coordination of the Internet Protocol addressing systems, as well as the Autonomous System Numbers used for routing Internet traffic.

Currently there are two types of Internet Protocol (IP) addresses in active use: IP version 4 (IPv4) and IP version 6 (IPv6). IPv4 was initially deployed on 1 January 1983 and is still the most commonly used version. IPv4 addresses are 32-bit numbers often expressed as 4 octets in “dotted decimal” notation (for example, 192.0.2.53). Deployment of the IPv6 protocol began in 1999. IPv6 addresses are 128-bit numbers and are conventionally expressed using hexadecimal strings (for example, 2001:0db8:582:ae33::29).

Both IPv4 and IPv6 addresses are generally assigned in a hierarchical manner. 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):

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  “你覺得這樣做你舅舅就會打消讓你自生自滅的想法了?”   “所以師傅就把張安世推在前面?”天天操   蹲在地上的雲瑯陪著笑臉道︰“火苗點燃,清氣自生。”日日啪   長門宮遭了天災!   然而,精神力雖然強大,卻一樣是要依靠事實存在的身體來作為依托的。射死你天天日   雲瑯連連點頭道︰“不錯,不錯,這馬屁拍的扎實,為師生受了。這些時日你就留在長安,見見百家尊長,听听百家見聞也是極好的。覺得有用,就努力學習,如果覺得沒用,就一笑置之,莫要在長安惹出什麼事端來。為師答應董仲舒袖手旁觀,又從桑弘羊那里得到了錢莊放貸的許可。這個人情很大,我們要記得。”
Map of RIRs
RegistryArea Covered
AFRINICAfrica Region
APNICAsia/Pacific Region
ARINCanada, USA, and some Caribbean Islands
LACNICLatin America and some Caribbean Islands
RIPE NCCEurope, the Middle East, and Central Asia

Our primary role for IP addresses is to allocate pools of unallocated addresses to the RIRs according to their needs as described by global policy and to document protocol assignments made by the IETF. When an RIR requires more IP addresses for allocation or assignment within its region, we make an additional allocation to the RIR. We do not make allocations directly to ISPs or end users except in specific circumstances, such as allocations of multicast addresses or other protocol specific needs.

IP Address Allocations

Internet Protocol Version 4 (IPv4)

Internet Protocol Version 6 (IPv6)

Autonomous System Number Allocations

Procedures

Regional Internet Registry Creation

Technical Documentation