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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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  身為人家的老師,雲瑯從來沒想害自己的每一個弟子。   “為何?”天天操——caoporn   劉徹道︰“阿姊還有什麼話一起道來,在我這里沒有什麼好忌諱的。”天天爱搞搞狠狠爱   雲瑯剛才的動作有些大了,驚動了老虎,老虎從桌子底下伸長了脖子露出那張憨厚的臉瞅著雲瑯。   越陌度阡,枉用相存。契闊談,心念舊恩。月明星稀,烏鵲南飛。繞樹三匝,何枝可依?”這些句子唱出來的時候,劉徹以為衛青已經唱完了,畢竟,雲瑯作的短歌行到這里就該結束了,這幾句並不是一些吉祥話,換一個場合,劉徹可能會潸然淚下一下,在這樣的奏對場合,這些話除過說皇帝刻薄寡恩之外,沒有別的解釋。亚洲影院   果然,雲瑯丟開兒子,蹲下來撫摸著老虎的肚皮道︰“沒混上一頓飯吃?”
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