Allocated but unannounced space
Every block here was allocated or assigned by a regional internet registry, and none of them appeared in any routing table we collected at our last snapshot — neither as a route of their own, nor covered by a larger announcement, nor carved up into more specifics.
“Unannounced” does not mean “unused”
Plenty of allocated space is deliberately kept off the public internet: private interconnects, lab and lawful-intercept ranges, networks reachable only inside one operator, and space held in reserve. Some of it is announced somewhere our collectors cannot see, which is a limit of our vantage points rather than a fact about the block.
It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today. Nothing on this page means a block is unallocated, available, or free to announce.
Browse by registry
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Countries with unannounced space registered through ARIN, largest first.
Unannounced blocks registered through ARIN
30,461 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 194.164.128.0/21 | 2k | ARIN |  US | 16th May 2024 |
| 194.164.184.0/21 | 2k | ARIN | US | 16th May 2024 |
| 194.164.208.0/21 | 2k | ARIN | US | 16th May 2024 |
| 194.164.40.0/21 | 2k | ARIN | US | 16th May 2024 |
| 194.179.146.0/23 | 512 | ARIN | US | 9th Dec 2024 |
| 194.26.194.0/24 | 256 | ARIN | US | 13th Feb 2024 |
| 194.33.149.0/24 | 256 | ARIN | US | 18th Jan 2022 |
| 195.180.176.0/20 | 4.1k | ARIN | US | 3rd Jun 2024 |
| 195.2.252.0/23 | 512 | ARIN | US | 24th Feb 2022 |
| 195.206.144.0/20 | 4.1k | ARIN | US | 3rd Jun 2024 |
| 195.85.36.0/24 | 256 | ARIN | US | 7th Jul 2023 |
| 196.1.136.0/24 | 256 | ARIN |  JM | 24th Aug 1994 |
| 196.1.140.0/24 | 256 | ARIN | US | 13th Dec 1994 |
| 196.1.141.0/24 | 256 | ARIN |  PR | 17th Jan 1995 |
| 196.1.142.0/24 | 256 | ARIN | US | 31st Mar 1995 |
| 196.12.64.0/18 | 16.4k | ARIN |  BM | 11th Jul 1994 |
| 196.216.1.0/24 | 256 | ARIN | US | 8th Feb 1993 |
| 196.3.104.0/24 | 256 | ARIN | JM | 10th May 1995 |
| 196.3.153.0/24 | 256 | ARIN | JM | 31st Aug 1995 |
| 196.3.73.0/24 | 256 | ARIN |  GD | 2nd Feb 1994 |
| 196.32.0.0/21 | 2k | ARIN | JM | 2nd Oct 1995 |
| 196.4.46.0/23 | 512 | ARIN | US | 28th Jan 1994 |
| 196.4.64.0/22 | 1k | ARIN | US | 28th Jan 1994 |
| 198.1.16.0/21 | 2k | ARIN | US | 4th Jan 1993 |
| 198.1.24.0/23 | 512 | ARIN | US | 4th Jan 1993 |
| 198.1.8.0/21 | 2k | ARIN | US | 20th Nov 1992 |
| 198.100.24.0/21 | 2k | ARIN | US | 19th Apr 2013 |
| 198.100.32.0/21 | 2k | ARIN | US | 23rd Mar 1993 |
| 198.100.40.0/23 | 512 | ARIN | US | 23rd Mar 1993 |
| 198.100.64.0/20 | 4.1k | ARIN | US | 26th Mar 1993 |
| 198.100.8.0/21 | 2k | ARIN | US | 19th Mar 1993 |
| 198.100.80.0/21 | 2k | ARIN | US | 26th Mar 1993 |
| 198.100.88.0/22 | 1k | ARIN | US | 26th Mar 1993 |
| 198.100.92.0/23 | 512 | ARIN | US | 26th Mar 1993 |
| 198.101.4.0/23 | 512 | ARIN | US | 24th Mar 1993 |
| 198.101.6.0/24 | 256 | ARIN | US | 24th Mar 1993 |
| 198.102.0.0/24 | 256 | ARIN | US | 18th Mar 1993 |
| 198.102.100.0/24 | 256 | ARIN | US | 29th Mar 1993 |
| 198.102.101.0/24 | 256 | ARIN | US | 29th Mar 1993 |
| 198.102.102.0/24 | 256 | ARIN | US | 29th Mar 1993 |
| 198.102.105.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 198.102.107.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 198.102.108.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 198.102.112.0/23 | 512 | ARIN | US | 25th Mar 1993 |
| 198.102.114.0/24 | 256 | ARIN | US | 25th Mar 1993 |
| 198.102.115.0/24 | 256 | ARIN | US | 25th Mar 1993 |
| 198.102.116.0/23 | 512 | ARIN | US | 25th Mar 1993 |
| 198.102.118.0/23 | 512 | ARIN | US | 25th Mar 1993 |
| 198.102.120.0/24 | 256 | ARIN | US | 25th Mar 1993 |
| 198.102.121.0/24 | 256 | ARIN | US | 25th Mar 1993 |