A类的地址,子网掩码是255.0.0.0或者/8,是公网的地址,但是有一些A类的地址再IP地址分配之初已经分配给了一些组织或者一些公司(大部分是互联网的早期推动者),那么这些IP地址都分配给谁了呢?
值得一提的是,有一些组织例如斯坦福大学( Stanford University)为了让IPv4地址枯竭时间延后一点,甚至将自己原有的保留地址36.0.0.0/8归还到公共地址池里面去。
具体的内容可以参见一下表格,转自http://en.wikipedia.org/wiki/List_of_assigned_/8_IPv4_address_blocks
Block | Organization | IANADate | RIRDate | Notes |
---|---|---|---|---|
0.0.0.0/8 | IANA - Local Identification | 1981-09 | Originally IANA - Reserved 1981-09. 0.0.0.0/8 reserved for self-identification (RFC 5735). | |
1.0.0.0/8 | APNIC | 2010-01 | Formerly IANA - Reserved 1981-09. | |
2.0.0.0/8 | RIPE NCC | 2009-10 | Formerly IANA - Reserved 1981-09. | |
3.0.0.0/8 | General Electric Company | 1994-05 | 1988-02-23 | |
4.0.0.0/8 | Level 3 Communications, Inc. | 1992-12 | 1992-12-01 | Originally Bolt Beranek and Newman Inc. (then GTE, then Genuity) 1992-12. Updated to Level 3 Communications, Inc. in 2007-04. |
5.0.0.0/8 | RIPE NCC | Formerly IANA - Reserved 1995-07. | ||
6.0.0.0/8 | Army Information Systems Center | 1994-02 | 1994-02-01 | Headquarters, USAISC. |
7.0.0.0/8 | Administered byARIN | 1995-04 | 1997-11-24 | Formerly IANA - Reserved 1995-04. Entirely assigned to DoD Network Information Center (DNIC) 1997-11-24. Updated to Administered by ARIN not before 2007. |
8.0.0.0/8 | Level 3 Communications, Inc. | 1992-12 | 1992-12-01 | Originally Bolt Beranek and Newman Inc. (then GTE, then Genuity) 1992-12. Updated to Level 3 Communications, Inc. in 2007-04. |
9.0.0.0/8 | IBM | 1992-08 | 1988-12-16 | |
10.0.0.0/8 | IANA - Private Use | 1995-06 | Reserved for Private-Use Networks (RFC 1918). Formerly ARPANET.[1] | |
11.0.0.0/8 | DoD Intel Information Systems | 1993-05 | 1984-01-19 | |
12.0.0.0/8 | AT&T Services | 1995-06 | 1983-08-23 | Originally AT&T Bell Laboratories, retained by AT&T when Bell Labs was spun off to Lucent Technologies in 1996. |
13.0.0.0/8 | Xerox Corporation | 1991-09 | 1986-04-25 | Xerox Palo Alto Research Center (PARC). |
14.0.0.0/8 | APNIC | 2010-04 | Formerly IANA - Public Data Network 1991-06-01, then IANA - Reserved 2008-01-22. Returned to IANA in 2008. One of the Class A networks (14.0.0.0/8) was used to map between Internet Addresses and the Public Data Network Addresses (X.121). This network was reclaimed by IANA in 2007 and was subsequently re-allocated in 2010. See RFC 877 and RFC 1356 for historical information.[2] | |
15.0.0.0/8 | Hewlett-Packard Company | 1994-07 | 1994-07-01 | |
16.0.0.0/8 | Digital Equipment Corporation | 1994-11 | 1989-05-18 | Digital Equipment Corporation, then Compaq, then Hewlett-Packard. |
17.0.0.0/8 | Apple Inc. | 1992-07 | 1990-04-16 | |
18.0.0.0/8 | MIT | 1994-01 | 1994-01-01 | |
19.0.0.0/8 | Ford Motor Company | 1995-05 | 1988-06-15 | |
20.0.0.0/8 | Computer Sciences Corporation | 1994-10 | 1989-09-04 | |
21.0.0.0/8 | DDN-RVN | 1991-07 | 1991-07-01 | DoD Network Information Center (DNIC). |
22.0.0.0/8 | Defense Information Systems Agency | 1993-05 | 1989-06-26 | DoD Network Information Center (DNIC). |
23.0.0.0/8 | ARIN | 2010-11 | Formerly IANA - Reserved 1995-07. | |
24.0.0.0/8 | ARIN | 2001-05 | 2001-05-01 | Formerly IANA - Cable Block 1995-07, then ARIN - Cable Block 2001-05.[3] Updated to ARIN not before 2007. |
25.0.0.0/8 | UK Ministry of Defence | 1995-01 | 1985-01-28 | Originally Royal Signals and Radar Establishment. Updated to UK Ministry of Defence in 2006-01. |
26.0.0.0/8 | Defense Information Systems Agency | 1995-05 | 1995-05-01 | DoD Network Information Center (DNIC). |
27.0.0.0/8 | APNIC | 2010-01 | Formerly IANA - Reserved 1995-04. | |
28.0.0.0/8 | DSI-North | 1992-07 | DoD Network Information Center (DNIC). | |
29.0.0.0/8 | Defense Information Systems Agency | 1991-07 | 1991-07-01 | DoD Network Information Center (DNIC). |
30.0.0.0/8 | Defense Information Systems Agency | 1991-07 | 1991-07-01 | DoD Network Information Center (DNIC). |
31.0.0.0/8 | RIPE NCC | 2010-05 | 2010-05-18 | Formerly IANA - Reserved 1991-04. |
32.0.0.0/8 | AT&T Global Network Services | 1994-06 | 1990-05-30 | Originally Norsk Informasjonsteknology. IBM acquired Norsk Informasjonsteknologi (Norway) in 1995. Updated to AT&T Global Network Services in 2007-08. |
33.0.0.0/8 | DLA Systems Automation Center | 1991-01 | 1991-01-01 | DoD Network Information Center (DNIC). |
34.0.0.0/8 | Halliburton Company | 1993-03 | 1991-03-11 | |
35.0.0.0/8 | MERIT Computer Network | 1994-04 | 1994-04-01 | |
36.0.0.0/8 | APNIC | 2010-10 | Formerly Stanford University 1993-04, then IANA - Reserved 2000-07. | |
37.0.0.0/8 | RIPE NCC | 2010-11 | Formerly IANA - Reserved 1995-04. | |
38.0.0.0/8 | PSINet, Inc. | 1994-09 | 1991-04-16 | PSINet, then Cogent Communications. |
39.0.0.0/8 | APNIC | 2011-01 | Formerly IANA - Reserved 1995-04. | |
40.0.0.0/8 | Eli Lilly & Company | 1994-06 | 1991-04-23 | |
41.0.0.0/8 | AfriNIC | 2005-04 | Formerly IANA - Reserved 1995-05. | |
42.0.0.0/8 | APNIC | 2010-10 | Formerly IANA - Reserved 1995-07. | |
43.0.0.0/8 | APNIC | 1991-01 | 1989-02-21 | Originally Japan Inet 1991-01 (IANA Date) or 1989-02-21 (RIR Date). Administered by APNIC not before 2007. |
44.0.0.0/8 | Amateur Radio Digital Communications | 1992-07 | 1992-07-01 | |
45.0.0.0/8 | ARIN | 1995-01 | 1991-09-09 | Formerly Interop Show Network 1995-01 or 1991-09-09 (RIR Date). Returned to ARIN in 2010-10 except a /15 block. In 2011 it will become available for distribution (or possibly be returned to the IANA, depending on the global policy in effect at that time).[4] |
46.0.0.0/8 | RIPE NCC | 2009-09 | Formerly Bolt Beranek and Newman Inc. 1992-12. Returned to IANA in 2007-04.[5] Updated to IANA - Reserved in 2007-04. | |
47.0.0.0/8 | Bell-Northern Research | 1991-01 | 1989-01-06 | Bell-Northern Research, formerly absorbed into Nortel, portions of which are now owned by Bell Aliant, Cablevision, Microsoft, and Vodafone. |
48.0.0.0/8 | Prudential Securities Inc. | 1995-05 | 1990-12-07 | The Prudential Insurance Company of America. |
49.0.0.0/8 | APNIC | 2010-08 | Formerly Joint Technical Command (Returned to IANA Mar 98) 1994-05. Updated to IANA - Reserved in 2007-05. | |
50.0.0.0/8 | ARIN | 2010-02 | Formerly Joint Technical Command (Returned to IANA Mar 98) 1994-05. Updated to IANA - Reserved in 2007-05. | |
51.0.0.0/8 | UK Government Department for Work and Pensions | 1994-08 | 1991-09-16 | |
52.0.0.0/8 | E.I. duPont de Nemours and Co., Inc. | 1991-12 | 1991-12-19 | |
53.0.0.0/8 | Cap Debis CCS | 1993-10 | 1992-03-17 | Cap Debis CCS (Daimler AG). |
54.0.0.0/8 | Merck and Co., Inc. | 1992-03 | 1992-03-17 | Merck has entered into a private sale with Amazon.com for some of their IP address space.[6] They unnumbered 48 /16s as of 01/2012, an additional 16 /16s as of 05/2013, and an additional 16 /16s as of 11/2013 leaving them with about 70% of their original /8. |
55.0.0.0/8 | DoD Network Information Center | 1995-04 | 1996-10-26 | Headquarters, USAISC. Formerly Boeing Computer Services 1995-04. Updated to DoD Network Information Center in 2007-02. |
56.0.0.0/8 | US Postal Service | 1994-06 | 1992-11-02 | |
57.0.0.0/8 | SITA | 1995-05 | 1993-06-21 | |
60.0.0.0/8 | APNIC | 2010-01 | Formerly IANA - Reserved 1981-09. | |
61.0.0.0/8 | APNIC | 2010-01 | Formerly IANA - Reserved 1981-09. | |
88.0.0.0/8 | APNIC | 2010-01 | Formerly IANA - Reserved 1981-09. | |
111.0.0.0/8 | APNIC | 2010-01 | Formerly IANA - Reserved 1981-09. | |
114.0.0.0/8 | APNIC | 2010-01 | Formerly IANA - Reserved 1981-09. | |
107.0.0.0/8 | ARIN | 2010-02 | 2010-02-11 | |
120.0.0.0/8 | APNIC | 2010-01 | Formerly IANA - Reserved 1981-09. | |
127.0.0.0/8 | IANA - Loopback | 1981-09 | 127.0.0.0/8 is reserved for Loopback (RFC 5735). | |
128.0.0.0/8 | RIPE NCC | Various Registries (Maintained by RIPE NCC). 128.0.0.0 is the start address of formerly "Class B". | ||
169.0.0.0/8 | ARIN | 1993-05 | 1993-05-01 | Various Registries (Maintained by ARIN). 169.254.0.0/16 (169.254.0.0–169.254.255.255) reserved for link-local addressing (RFC 5735). |
172.0.0.0/8 | ARIN | 1993-05 | 1993-05-01 | Various Registries (Maintained by ARIN). 172.16.0.0/12 (172.16.0.0–172.31.255.255) reserved for private networks (RFC 1918). |
183.0.0.0/8 | APNIC | 2010-01 | Formerly IANA - Reserved 1981-09. | |
192.0.0.0/8 | ARIN | 1993-05 | 1993-05-01 | Various Registries (Maintained by ARIN). 192.0.2.0/24 reserved for TEST-NET-1 (RFC 5737). 192.88.99.0/24 reserved for 6to4 Relay Anycast (RFC 3068). 192.168.0.0/16 (192.168.0.0–192.168.255.255) reserved for private networks (RFC 1918). 192.0.0.0/24 reserved for IANA IPv4 Special Purpose Address Registry (RFC 5736). 192.0.0.0 is the start address of formerly "Class C". |
198.0.0.0/8 | ARIN | 1993-05 | Various Registries (Maintained by ARIN). 198.18.0.0/15 reserved for Network Interconnect Device Benchmark Testing (RFC 5735). 198.51.100.0/24 reserved for TEST-NET-2 (RFC 5737). | |
202.0.0.0/8 | APNIC | 2009-10 | 202.123.0.0/19 transferred to AfriNIC | |
203.0.0.0/8 | APNIC | 1993-05 | 203.0.113.0/24 reserved for TEST-NET-3 (RFC 5737). | |
214.0.0.0/8 | US-DOD | 1998-03 | 1998-03-27 | DoD Network Information Center (DNIC). |
215.0.0.0/8 | US-DOD | 1998-03 | 1998-06-05 | DoD Network Information Center (DNIC). |
218.0.0.0/8 | APNIC | 2010-01 | Formerly IANA - Reserved 1981-09. | |
224.0.0.0/8–239.0.0.0/8 | Multicast | 1981-09 | 1991-05-22 | Multicast (formerly "Class D") (RFC 5771) registered in [1]. 224.0.0.0/4. |
240.0.0.0/8–255.0.0.0/8 | Future Use | 1981-09 | Reserved for future use (formerly "Class E") (RFC 1112). 255.255.255.255 is reserved for "limited broadcast" destination address (RFC 919) and (RFC 922). 240.0.0.0/4. |
文章评论
买吧,ipv4还是有的吧,虽然快枯竭
@肖振杰博客 一直说快没了,还是在用呢,不过估计等物联网正式普及的时候,IPv6不得不也流行起来
ipv4已近枯竭,一个独立IP难求啊