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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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“又患膀胱炎了,”他朝我笑道,一面指著汽車,“每次出車都是這樣。一本首道久久综合久久爱 可是隔一會兒我就嚇得直跳起來。因為這封信已經擱在桌上——這怎麼 可能呢?——就放在燈光照射的光圈之中。我剛才以為這封信還藏在我胸口 的口袋里呢,——是的,信就在那里,一個四四方方的藍信封,十分熟悉的 筆跡。天天综合网久久网 不要再想它——真是孩子氣的命令,仿佛一個人激動的神經什麼時候想 到去屈服于自己意志的羈絆和控制,不要再想它,然而思想卻像受驚、脫韁 的馬群,奮起擂鼓般迅急、沉重的馬蹄,在兩個太陽穴之間狹窄的空間里奔 馳沖突。不要再想它,然則記憶卻一刻不停地把畫面一幅接一幅地幻化出來, 神經震顫不已,飄搖不定,各種感官部緊張起來抵御反抗!不要再想它,然 而那些信紙寫滿了熾熱的人的詞句,還在燒的著我的手。這一張又一張的信 紙,我拿起來,又放下去,拿來再讀,把第一封和第二封兩相比較,直到每 一個字都像一個個烙印似的刻在腦子里!不要再想它,然而我能想的,不就 只有這件事,這一件事嗎︰如何逃脫,如何抵抗?如何使自己擺脫這貪婪的 步步進逼,這出乎意料的縱情任性? 我讀了又讀,一再從頭讀起。我的雙手瑟瑟直抖,有人這樣拼命地愛我,天天影院色香欲综合 不要看信!我對我自己說。千萬不要在今天看這封信。千萬不要再卷到
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