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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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一操再操日日操 日日操 操到身体好 少朗看他進了書房,放下他的煙斗站起來,他說維杉來得正好,他約了幾個人吃晚飯。叔謙已經在屋內,還有老晉。維杉知道他們免不了要打牌的,笑說︰“拿我來湊腳,我不來。” 孩子們約他清早里逛北海,目的當然是搖船。他去了,雖然好幾次他想設法推辭不去的。他穿他的白 蘭褲子葛布上衣,拿了他的草帽微覺得可笑,他近來永遠地覺得自己好笑,這種橫生的幽默,他自己也不了解的。他一徑走到北海的門口還想著要回頭的。站崗的巡警向他看了一眼,奇怪,有時你走路時忽然望到巡警冷靜的眼光,真會使你怔一下,你要自問你都做了些什麼事,準知道沒有一件是違法的麼?他買到票走進去,猛抬頭看到那橋前的牌樓。牌樓,白石橋,垂柳,都在注視他。他不痛快極了,挺起腰來健步走到旁邊小路上,表示不耐煩。不耐煩的臉本來與他最相宜的,他一失掉了“不耐煩”的神情,便好像丟掉了好朋友,心里便不自在。懂得吧?他繞到後邊,隔岸看一看白塔,它是自在得很,永遠帶些不耐煩的臉站著,還是坐著?——它不懂得什麼年輕,老,這一些無聊的日月,它只是站著不動,腳底下自有湖水,亭榭松柏,楊柳,人——老的小的——忙著他們更換的糾紛!日日操 9
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