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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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  山神爺爺也似乎覺察到了這個問題,他特意放慢了語速,一字一句的問道?   更何況太宰也沒有什麼東西好繼承的,付出比收獲更大的時候,傻子都知道該怎麼做選擇。亚洲   霍去病手里拿著兩塊野三七搖搖頭道︰“他是我的,不許你們搶。老秦人?縉雲氏?雲瑯?耶耶記住了,明年的今日,耶耶等你!”日韩   那些被細細磨碎篩選出來的泥料被雲瑯泡在水甕里面,為此,還用腳丫子踩了成千上萬遍。   翻遍了石屋終于找到了一根針,看著這枚比錐子小不到那里去的鐵針,雲瑯不屑的撇撇嘴,這東西用來縫制麻袋自然是極好的,用來制作衣衫,實在是……国产   雲瑯自然有無數的大道理可以說,不過,他不準備跟太宰說,說到了會死人的。
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