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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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聰,親愛的孩子,關于你所接觸的音樂界,你所來往的各方面的朋友,同我們講得太少了。你真不知道你認為trivialthing[無足輕重的事],在我們卻是新鮮事兒,都是knowledge[知識];你知道對于我們,得到新的knowledge[知識],就是無上的樂趣。譬如這次彌拉告訴我們的(爸爸信上問的)HarrietCohen[哈理特科恩]獎金的事,使我們知道了西方音樂界的一種情況,爸爸說那是小小的喜劇。JuliusKetchen[朱利葉斯凱琴]?的同你討論Beethoven[貝多芬]的Sonata[奏鳴曲],又使我們領會到另一種情況;表示藝術家之間坦白真誠的思想交流。像你爸爸這樣會吸收,會舉一反三的人,對這些事的確感到很大的興趣。他要你多提音樂界的事,無非是進取心強,不甘落後,要了解國外藝術界的現狀,你何樂而不為呢?他一知道你對希臘精神的向往,但認為你對希臘精神還不明確,他就不厭其煩的想要滿足你。因為丹納的《藝術哲學》不知何時出版,他最近竟重理舊稿,把其中講希臘的一個chapter[章],約五萬余字,每天抽出一部分時間抄錄,預備寄你。爸爸雖是腰瘧背痛,眼花流淚(多寫了還要頭痛),但是為了你,他什麼都不顧了。前幾天我把舊稿替他理出來,他自己也嚇了一跳,原來的稿于,字寫得像螞蟻一樣小,不得不用了放大鏡來抄,而且還要仔仔細細的抄,否則就要出錯。他這樣壞的身體,對你的devo-tion[愛護],對你的關懷,我看了也感動。孩子,世界上像你爸爸這樣的無微不至的教導,真是罕有的。你要真心的接受,而且要拿實際行動來表示。來信千萬別籠籠統統的,多一些報道,讓他心里感到溫暖快樂,這就是你對爸爸的報答。……注册彩票网站怎样注销 彩票 注册送28 彩票创意图
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