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IPV4 Internet Address Segment List

Reference: www.iana.org; Details under: http://www.iana.org/assignments/ipv4-address-space
Original last updated 2009-08-03 // adapted by ForumS9. See explanations below.

IPSEG SEGDATE TYP DOM RIR NAME_DESC REMARK
000/8 Sep 81 1     IANA - Reserved  
001/8 Sep 81 1     IANA - Reserved
002/8 Sep 81 1     IANA - Reserved  
003/8 May 94 2 US   General Electric Company LEGACY
004/8 Dec 92 2 US   Level 3 Communications, Inc. LEGACY
005/8 Jul 95 1     IANA - Reserved UNALLOCATED
006/8 Feb 94 2 US   Army Information Systems Center LEGACY
007/8 Apr 95 1     IANA - Reserved  
008/8 Dec 92 2 US   Level 3 Communications, Inc.  
009/8 Aug 92 2 US   IBM  
010/8 Jun 95 9     IANA - Private Use See [RFC1918]
011/8 May 93 2 US   DoD Intel Information Systems  
012/8 Jun 95 2 US   AT+T Bell Laboratories  
013/8 Sep 91 2 US   Xerox Corporation  
014/8 Jun 91 2     IANA - Public Data Network  
015/8 Jul 94 2 US   Hewlett-Packard Company  
016/8 Nov 94 2 US   Digital Equipment Corporation  
017/8 Jul 92 2 US   Apple Computer Inc.  
018/8 Jan 94 2 US   MIT, Mass. Inst. Technology  
019/8 May 95 2 US   Ford Motor Company  
020/8 Oct 94 2 US   Computer Sciences Corporation  
021/8 Jul 91 2 US   DDN-RVN  
022/8 May 93 2 US   Defense Information Systems Agency  
023/8 Jul 95 1     IANA - Reserved  
024/8 May 01 3 US ARIN ARIN - Cable Block (Formerly IANA - Jul 95)
025/8 Jan 95 2 GB   Royal Signals and Radar Establishment  
026/8 May 95 2 US   Defense Information Systems Agency  
027/8 Apr 95 1     IANA - Reserved  
028/8 Jul 92 2 US   DSI-North  
029/8 Jul 91 2 US   Defense Information Systems Agency  
030/8 Jul 91 2 US   Defense Information Systems Agency  
031/8 Apr 99 1     IANA - Reserved  
032/8 Jun 94 2     AT&T Global Network Services  
033/8 Jan 91 2 US   DLA Systems Automation Center  
034/8 Mar 93 2 US   Halliburton Company  
035/8 Apr 94 2 US   MERIT Computer Network  
036/8 Jul 00 1     IANA - Reserved (Formerly Stanford University - Apr 93)
037/8 Apr 95 1     IANA - Reserved  
038/8 Sep 94 2 US   Performance Systems International  
039/8 Apr 95 1     IANA - Reserved  
040/8 Jun 94 2 US   Eli Lily and Company  
041/8 Apr 05 3   AFRINIC AfriNIC (new since 2005) (whois.afrinic.net)
042/8 Jul 95 1     IANA - Reserved  
043/8 Jan 91 2 JP   Japan Internet  
044/8 Jul 92 2 US   Amateur Radio Digital Communications  
045/8 Jan 95 2 US   Interop Show Network  
046/8 Dec 92 1   IANA Reserved  
047/8 Jan 91 2 US   Bell-Northern Research  
048/8 May 95 2 US   Prudential Securities Inc.  
049/8 May 94 2 US   Joint Technical Command (Returned to IANA Mar 98)
050/8 May 94 2 US   Joint Technical Command (Returned to IANA Mar 98)
051/8 Aug 94 2 GB   Department of Social Security of UK  
052/8 Dec 91 2 US   E.I. duPont de Nemours and Co.  
053/8 Oct 93 2 DE   Cap Debis CCS  
054/8 Mar 92 2 US   Merck and Co.  
055/8 Apr 95 2 US   DoD Network Information Center  
056/8 Jun 94 2 US   U.S. Postal Service  
057/8 May 95 2 FR   SITA, Soc. Int. Telecom Aero  
058/8 Apr 04 3   APNIC APNIC (whois.apnic.net)
059/8 Apr 04 3   APNIC APNIC (whois.apnic.net)
060/8 Apr 03 3   APNIC APNIC (whois.apnic.net)
061/8 Apr 97 3   APNIC APNIC (whois.apnic.net)
062/8 Apr 97 3   RIPE RIPE NCC  
063/8 Apr 97 3   ARIN ARIN (whois.arin.net)
064/8 Jul 99 3   ARIN ARIN (whois.arin.net)
065/8 Jul 00 3   ARIN ARIN (whois.arin.net)
066/8 Jul 00 3   ARIN ARIN (whois.arin.net)
067/8 May 01 3   ARIN ARIN (whois.arin.net)
068/8 Jun 01 3   ARIN ARIN (whois.arin.net)
069/8 Aug 02 3   ARIN ARIN (whois.arin.net)
070/8 Jan 04 3   ARIN ARIN (whois.arin.net)
071/8 Aug 04 3   ARIN ARIN (whois.arin.net)
072/8 Aug 04 3   ARIN ARIN (whois.arin.net)
073/8 Mar 05 3   ARIN ARIN (whois.arin.net)
074/8 Jun 05 3   ARIN ARIN (whois.arin.net)
075/8 Jun 05 3   ARIN ARIN (whois.arin.net)
076/8 Jun 05 3   ARIN ARIN (whois.arin.net)
077/8 Aug 06 3   RIPE RIPE NCC  
078/8 Aug 06 3   RIPE RIPE NCC  
079/8 Aug 06 3   RIPE RIPE NCC  
080/8 Apr 01 3   RIPE RIPE NCC (whois.ripe.net)
081/8 Apr 01 3   RIPE RIPE NCC (whois.ripe.net)
082/8 Nov 02 3   RIPE RIPE NCC (whois.ripe.net)
083/8 Nov 03 3   RIPE RIPE NCC (whois.ripe.net)
084/8 Nov 03 3   RIPE RIPE NCC (whois.ripe.net)
085/8 Apr 04 3   RIPE RIPE NCC (whois.ripe.net)
086/8 Apr 04 3   RIPE RIPE NCC (whois.ripe.net)
087/8 Apr 04 3   RIPE RIPE NCC (whois.ripe.net)
088/8 Apr 04 3   RIPE RIPE NCC (whois.ripe.net)
089/8 Jun 05 3   RIPE RIPE NCC (whois.ripe.net)
090/8 Jun 05 3   RIPE RIPE NCC (whois.ripe.net)
091/8 Jun 05 3   RIPE RIPE NCC (whois.ripe.net)
092/8 Mar 07 3   RIPE RIPE NCC (whois.ripe.net)
093/8 Mar 07 3   RIPE RIPE NCC (whois.ripe.net)
094/8 Jul 07 3   RIPE RIPE NCC (whois.ripe.net)
095/8 Jul 07 3   RIPE RIPE NCC (whois.ripe.net)
096/8 Oct 06 3   ARIN ARIN (whois.arin.net)
097/8 Oct 06 3   ARIN ARIN (whois.arin.net)
098/8 Oct 06 3   ARIN ARIN (whois.arin.net)
099/8 Oct 06 3   ARIN ARIN (whois.arin.net)
100/8 Sep 81 1     IANA - Reserved  
101/8 Sep 81 1     IANA - Reserved  
102/8 Sep 81 1     IANA - Reserved  
103/8 Sep 81 1     IANA - Reserved  
104/8 Sep 81 1     IANA - Reserved  
105/8 Sep 81 1     IANA - Reserved  
106/8 Sep 81 1     IANA - Reserved  
107/8 Sep 81 1     IANA - Reserved  
108/8 Dec 08 3   ARIN ARIN whois.arin.net
109/8 Jan 09 3   RIPE RIPE whois.ripe.net
110/8 Nov 08 3   APNIC APNIC whois.apnic.net
111/8 Nov 08 3   APNIC APNIC whois.apnic.net
112/8 May 08 3   APNIC APNIC whois.apnic.net
113/8 May 08 3   APNIC APNIC whois.apnic.net
114/8 Oct 07 3   APNIC APNIC (whois.apnic.net)
115/8 Oct 07 3   APNIC APNIC (whois.apnic.net)
116/8 Jan 07 3   APNIC APNIC (whois.apnic.net)
117/8 Jan 07 3   APNIC APNIC (whois.apnic.net)
118/8 Jan 07 3   APNIC APNIC (whois.apnic.net)
119/8 Jan 07 3   APNIC APNIC (whois.apnic.net)
120/8 Jan 07 3   APNIC APNIC (whois.apnic.net)
121/8 Jan 06 3   APNIC APNIC (whois.apnic.net)
122/8 Jan 06 3   APNIC APNIC (whois.apnic.net)
123/8 Jan 06 3   APNIC APNIC (whois.apnic.net)
124/8 Jan 05 3   APNIC APNIC (whois.apnic.net)
125/8 Jan 05 3   APNIC APNIC (whois.apnic.net)
126/8 Jan 05 3   APNIC APNIC (whois.apnic.net)
127/8 Sep 81 1     IANA - Reserved Loopback
128/8 May 93 4     Various Registries  
129/8 May 93 4     Various Registries  
130/8 May 93 4     Various Registries  
131/8 May 93 4     Various Registries  
132/8 May 93 4     Various Registries  
133/8 May 93 4     Various Registries  
134/8 May 93 4     Various Registries  
135/8 May 93 4     Various Registries  
136/8 May 93 4     Various Registries  
137/8 May 93 4     Various Registries  
138/8 May 93 4     Various Registries  
139/8 May 93 4     Various Registries  
140/8 May 93 4     Various Registries  
141/8 May 93 4     Various Registries  
142/8 May 93 4     Various Registries  
143/8 May 93 4     Various Registries  
144/8 May 93 4     Various Registries  
145/8 May 93 4     Various Registries  
146/8 May 93 4     Various Registries  
147/8 May 93 4     Various Registries  
148/8 May 93 4     Various Registries  
149/8 May 93 4     Various Registries  
150/8 May 93 4     Various Registries  
151/8 May 93 4     Various Registries  
152/8 May 93 4     Various Registries  
153/8 May 93 4     Various Registries  
154/8 May 93 4     Various Registries  
155/8 May 93 4     Various Registries  
156/8 May 93 4     Various Registries  
157/8 May 93 4     Various Registries  
158/8 May 93 4     Various Registries  
159/8 May 93 4     Various Registries  
160/8 May 93 4     Various Registries  
161/8 May 93 4     Various Registries  
162/8 May 93 4     Various Registries  
163/8 May 93 4     Various Registries  
164/8 May 93 4     Various Registries  
165/8 May 93 4     Various Registries  
166/8 May 93 4     Various Registries  
167/8 May 93 4     Various Registries  
168/8 May 93 4     Various Registries  
169/8 May 93 4     Various Registries  
170/8 May 93 4     Various Registries  
171/8 May 93 4     Various Registries  
172/8 May 93 4     Various Registries  
173/8 Feb 08 3   ARIN ARIN whois.arin.net
174/8 Feb 08 3   ARIN ARIN whois.arin.net
175/8 Aug 09 3   APNIC APNIC whois.apnic.net
176/8 Apr 03 1     IANA - Reserved  
177/8 Apr 03 1     IANA - Reserved  
178/8 Jan 09 3   RIPE RIPE whois.ripe.net
179/8 Apr 03 1     IANA - Reserved  
180/8 Apr 09 3   APNIC APNIC whois.apnic.net
181/8 Apr 03 1     IANA - Reserved  
182/8 Aug 09 3   APNIC APNIC whois.apnic.net
183/8 Apr 09 3   APNIC APNIC whois.apnic.net
184/8 Dec 08 3   ARIN ARIN whois.arin.net
185/8 Apr 03 1     IANA - Reserved  
186/8 Sep 07 3   LACNIC LACNIC (whois.lacnic.net)
187/8 Sep 07 3   LACNIC LACNIC (whois.lacnic.net)
188/8 May 93 4     Various Registries  
189/8 Jun 05 3   LACNIC LACNIC (whois.lacnic.net)
190/8 Jun 05 3   LACNIC LACNIC (whois.lacnic.net)
191/8 May 93 4     Various Registries  
192/8 May 93 4     Various Registries  
193/8 May 93 3   RIPE RIPE NCC (whois.ripe.net)
194/8 May 93 3   RIPE RIPE NCC (whois.ripe.net)
195/8 May 93 3   RIPE RIPE NCC (whois.ripe.net)
196/8 May 93 3   AFRINIC Administered by AfriNIC whois.afrinic.net
197/8 Oct 08 3   AFRINIC AFRINIC whois.afrinic.net
198/8 May 93 4   ARIN Administered by ARIN whois.arin.net
199/8 May 93 3   ARIN ARIN (whois.arin.net)
200/8 Nov 02 3   LACNIC LACNIC (whois.lacnic.net)
201/8 Apr 03 3   LACNIC LACNIC (whois.lacnic.net)
202/8 May 93 3   APNIC APNIC (whois.apnic.net)
203/8 May 93 3   APNIC APNIC (whois.apnic.net)
204/8 Mar 94 3   ARIN ARIN (whois.arin.net)
205/8 Mar 94 3   ARIN ARIN (whois.arin.net)
206/8 Apr 95 3   ARIN ARIN (whois.arin.net)
207/8 Nov 95 3   ARIN ARIN (whois.arin.net)
208/8 Apr 96 3   ARIN ARIN (whois.arin.net)
209/8 Jun 96 3   ARIN ARIN (whois.arin.net)
210/8 Jun 96 3   APNIC APNIC (whois.apnic.net)
211/8 Jun 96 3   APNIC APNIC (whois.apnic.net)
212/8 Oct 97 3   RIPE RIPE NCC (whois.ripe.net)
213/8 Mar 99 3   RIPE RIPE NCC (whois.ripe.net)
214/8 Mar 98 2 US   US-DOD  
215/8 Mar 98 2 US   US-DOD  
216/8 Apr 98 3   ARIN ARIN (whois.arin.net)
217/8 Jun 00 3   RIPE RIPE NCC (whois.ripe.net)
218/8 Dec 00 3   APNIC APNIC (whois.apnic.net)
219/8 Sep 01 3   APNIC APNIC (whois.apnic.net)
220/8 Dec 01 3   APNIC APNIC (whois.apnic.net)
221/8 Jul 02 3   APNIC APNIC (whois.apnic.net)
222/8 Feb 03 3   APNIC APNIC (whois.apnic.net)
223/8 Apr 03 1     IANA - Reserved  
224/8 Sep 81 9     IANA - Multicast  
225/8 Sep 81 9     IANA - Multicast  
226/8 Sep 81 9     IANA - Multicast  
227/8 Sep 81 9     IANA - Multicast  
228/8 Sep 81 9     IANA - Multicast  
229/8 Sep 81 9     IANA - Multicast  
230/8 Sep 81 9     IANA - Multicast  
231/8 Sep 81 9     IANA - Multicast  
232/8 Sep 81 9     IANA - Multicast  
233/8 Sep 81 9     IANA - Multicast  
234/8 Sep 81 9     IANA - Multicast  
235/8 Sep 81 9     IANA - Multicast  
236/8 Sep 81 9     IANA - Multicast  
237/8 Sep 81 9     IANA - Multicast  
238/8 Sep 81 9     IANA - Multicast  
239/8 Sep 81 9     IANA - Multicast  
240/8 Sep 81 1     IANA - Reserved  
241/8 Sep 81 1     IANA - Reserved  
242/8 Sep 81 1     IANA - Reserved  
243/8 Sep 81 1     IANA - Reserved  
244/8 Sep 81 1     IANA - Reserved  
245/8 Sep 81 1     IANA - Reserved  
246/8 Sep 81 1     IANA - Reserved  
247/8 Sep 81 1     IANA - Reserved  
248/8 Sep 81 1     IANA - Reserved  
249/8 Sep 81 1     IANA - Reserved  
250/8 Sep 81 1     IANA - Reserved  
251/8 Sep 81 1     IANA - Reserved  
252/8 Sep 81 1     IANA - Reserved  
253/8 Sep 81 1     IANA - Reserved  
254/8 Sep 81 1     IANA - Reserved  
255/8 Sep 81 1     IANA - Reserved  

Explanations

The original IANA document does not provide the TYP, DOM and RIR columns, only as plain text.
This is an attempt to present the information in a more structured way, e.g. to implement a general (reverse) IP address lookup program.

Symbol Example Description
IPSEG 130/8 130/8 means all internet addresses between
130.0.0.0 and 130.255.255.255
RIR ARIN Regional Internet Registry
DOM US, FR Domicile Code, Country Code

Typ, Assignment Type

Typ Description Comment
1 Reserved segment Reserved, may be assigned in the future
2 Direct allocation Whole /8 segment assigned to a large company or organization
3 Regional internet registry Whole /8 segment assigned to single regional internet registry such as ARIN, RIPE, APNIC, ...
4 Various Registries Historical assignments, now managed by regional internet registry according to country
9 Special technical purpose Segment reserved for special technical purposes

Possible Strategy to identify an unknown IP address

Step 1   Table lookup in IPV4 Segment list, using most significant part of IP address; get TYP and possibly more information.
Step 2 Typ=1 IANA Segment description is final result; no country code
  Typ=2 IANA Segment description is final result
Domicile + Company / Organization is known
  Typ=3 RIR column tells which Internet Registry is responsible.
Detail information available using WHOIS service of this RIR.
  Typ=4 RIR + Country may be determined by using the published "stats" tables provided by the internet registries.
This table lookup delivers the country code + RIR symbol.
Detail information is available using WHOIS service of RIR.
  Typ=9 (unexpected). IP from technical segment. No further information available.