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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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莫扎特的作品跟他的生活是相反的。他的生活只有痛苦,但他的作品差不多整個兒只叫人感到快樂。他的作品是他靈魂的小影?。這樣,所有別的和諧都歸納到這個和諧,而且都融化在這個和諧中間。 自己彈的曲子,不宜盡彈,而常常要停下來想想,想曲子的picture[意境,境界],追問自己究竟要求的是怎樣一個境界,這是使你明白whatyouwant[你所要的是什麼],而且先在腦子里推敲曲于的結構、章法、起伏、高潮、低潮等等。盡彈而不想,近乎improvise[即興表演],彈到哪里算哪里,往往一個曲子練了二三個星期,自己還說不出哪一種彈法(interpretation)最滿意,或者是有過一次最滿意的interpretation[彈法],而以後再也找不回來(這是恩德常犯的毛病)。假如照我的辦法作,一定可能幫助自己的感情更明確而且穩定!天天色综合 可是事情不是沒有挽回的。我們為了丟失那封信,二十多天的精神痛苦,不能不算是付了很大的代價;現在可不可以要求你也付些代價呢?只要你每天花一小時的功夫,連續三四天,補寫一封長信給我們,事情就給補救了。而且你離開比賽時間久一些,也許你一切的觀感倒反客觀一些。我們極需要知道你對自己的演出的評價,對別人的評價,尤其是對于上四五名的。我一向希望你多發表些藝術感想,甚至對你彈的Chopin[蕭邦]某幾個曲子的感想。我每次信里都談些藝術問題,或是報告你國內樂壇消息,無非想引起你的回響,同時也使你經常了解國內的情形。天天色情 天天好逼网
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