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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 |
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 | 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 |
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. |