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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
30,449 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.189.95.0/24 | 256 | ARIN |  PR | 13th Jul 1992 |
| 192.189.98.0/24 | 256 | ARIN |  US | 13th Jul 1992 |
| 192.190.10.0/24 | 256 | ARIN | US | 17th Feb 1993 |
| 192.190.101.0/24 | 256 | ARIN | US | 24th Jun 1992 |
| 192.190.102.0/24 | 256 | ARIN | US | 24th Jun 1992 |
| 192.190.103.0/24 | 256 | ARIN | US | 24th Jun 1992 |
| 192.190.104.0/24 | 256 | ARIN | US | 23rd Jun 1992 |
| 192.190.105.0/24 | 256 | ARIN | US | 23rd Jun 1992 |
| 192.190.11.0/24 | 256 | ARIN | US | 8th Oct 1992 |
| 192.190.111.0/24 | 256 | ARIN | US | 12th Jul 1994 |
| 192.190.116.0/24 | 256 | ARIN | US | 23rd Jun 1992 |
| 192.190.117.0/24 | 256 | ARIN | US | 23rd Jun 1992 |
| 192.190.118.0/24 | 256 | ARIN | US | 23rd Jun 1992 |
| 192.190.119.0/24 | 256 | ARIN | US | 23rd Jun 1992 |
| 192.190.12.0/24 | 256 | ARIN | US | 18th Sept 1992 |
| 192.190.120.0/24 | 256 | ARIN | US | 23rd Jun 1992 |
| 192.190.128.0/24 | 256 | ARIN | US | 24th Jun 1992 |
| 192.190.13.0/24 | 256 | ARIN | US | 26th Oct 1992 |
| 192.190.14.0/24 | 256 | ARIN | US | 12th Oct 1992 |
| 192.190.148.0/22 | 1k | ARIN | US | 15th Jan 2021 |
| 192.190.15.0/24 | 256 | ARIN | US | 20th Jul 2015 |
| 192.190.17.0/24 | 256 | ARIN | US | 12th Oct 1992 |
| 192.190.175.0/24 | 256 | ARIN | US | 24th Jun 1992 |
| 192.190.176.0/24 | 256 | ARIN | US | 24th Jun 1992 |
| 192.190.178.0/24 | 256 | ARIN | US | 24th Jun 1992 |
| 192.190.179.0/24 | 256 | ARIN | US | 24th Jun 1992 |
| 192.190.18.0/24 | 256 | ARIN | US | 12th Oct 1992 |
| 192.190.19.0/24 | 256 | ARIN |  CA | 12th Jul 2019 |
| 192.190.194.0/24 | 256 | ARIN | US | 29th Jun 1992 |
| 192.190.195.0/24 | 256 | ARIN | US | 29th Jun 1992 |
| 192.190.196.0/24 | 256 | ARIN | US | 29th Jun 1992 |
| 192.190.197.0/24 | 256 | ARIN | US | 29th Jun 1992 |
| 192.190.198.0/24 | 256 | ARIN | US | 29th Jun 1992 |
| 192.190.199.0/24 | 256 | ARIN | US | 29th Jun 1992 |
| 192.190.2.0/24 | 256 | ARIN | US | 15th Jun 1992 |
| 192.190.20.0/23 | 512 | ARIN | US | 3rd Apr 2015 |
| 192.190.200.0/24 | 256 | ARIN | US | 29th Jun 1992 |
| 192.190.203.0/24 | 256 | ARIN | US | 29th Jun 1992 |
| 192.190.22.0/24 | 256 | ARIN | US | 29th Oct 1992 |
| 192.190.224.0/24 | 256 | ARIN | US | 1st Jul 1992 |
| 192.190.23.0/24 | 256 | ARIN | US | 15th Jun 1992 |
| 192.190.232.0/24 | 256 | ARIN | US | 21st Jul 2021 |
| 192.190.238.0/24 | 256 | ARIN | US | 8th Jul 1992 |
| 192.190.25.0/24 | 256 | ARIN | CA | 31st Jul 2020 |
| 192.190.250.0/24 | 256 | ARIN | US | 8th Jul 1992 |
| 192.190.251.0/24 | 256 | ARIN | US | 8th Jul 1992 |
| 192.190.3.0/24 | 256 | ARIN | US | 1st Sept 1992 |
| 192.190.33.0/24 | 256 | ARIN | US | 17th Jun 1992 |
| 192.190.34.0/23 | 512 | ARIN | US | 17th Jun 1992 |
| 192.190.36.0/24 | 256 | ARIN | US | 17th Jun 1992 |