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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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但是,沒有必要對這位“百有份”朋友進一步的描寫,(趨炎附勢之輩種類繁多,五花八門, 維也納人通常用“百有份”這個輕松的諷刺字眼來概括他們當中那些心地善良的清客類型,)因為誰 都熟悉他們,大家全部知道,你要是態度不粗暴,是無法抵御他們來親近你的那些舉動的。這些舉動 本身無害,而且動人。所以我無可奈何地在他身旁坐下,天南海北地瞎聊了一刻鐘。這時有位紳士走 進飯店。他身材頎長,臉色紅潤,而且年輕,可是兩鬢斑白,十分刺眼,看上去非常引人注目。他走 起路來,腰板挺直,一望而知他當過軍人。我鄰座的朋友以他典型的巴結勁跳起身來忙著招呼。那位 先生對他這熱乎勁的回答,與其說是彬彬有禮,毋寧說是滿不在乎。侍者急忙快步趕來,那位新來的 客人還沒點菜,我這位“百有份”朋友已經挪近我的身邊,在我耳邊輕聲說道︰“您知道他是誰嗎?” 我早已深知他這種收藏家的驕傲,他收藏中每一件稍微有趣一點的樣品都要拿出來炫耀一番。惟恐他 長篇大論地解釋個沒完,所以我只是冷淡地說了句︰“不知道”,表示興趣不大,一面繼續切我的巧 克力蛋糕。可是我這漠不關心的態度只能使這位攀高枝拉關系的能手更加興奮。他小心翼翼地用手遮 女人下体图片自拍图片 可是現在意想不到的事情竟然發生了。我懷著被這事激起的好奇心,驚偷拍自拍在线 國說起。自拍偷拍网 ? 卡薩諾瓦(1725—1798)︰意大利冒險家,善于追逐女性,這里以此諷刺伏林斯基上尉。
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