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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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  雲瑯搖頭道︰“靠母雞孵小雞是不成的,數量太少不說,沒辦法供應一座龐大的養雞場的。家里正在進行人工孵化,大夫想不想去看看?”   半個時辰後,雲瑯就已經跟曹襄坐在一輛馬車上行駛在陽陵邑城外的大道上了。色五月婷婷   老虎出來的那一刻,董君的馬車就開始狂奔,緊跟著他的車隊也跟著跑了。色爱区综合五月色爱区   冬瓜是雲瑯準備的儲存到冬天吃的蔬菜,自然種了很多,他甚至準備用冬瓜來腌制瓜條給孩子們當零食吃。   “歌姬不要,別的都要,牛馬,生鐵,銅器要佔到至少六成貨值,如果可能,驢子也要多些,家里婦孺多,驢子比較好使喚。還有啊,有磚瓦我也要,越多越好。”婷婷五月色综合色   如果有誰肯用這幾樣東西作為隱藏奸細的代價,即便他真的是奸細,皇帝也會睜一只眼閉一只眼,甚至會希望這樣的奸細越多越好。
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