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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in United States
26,289 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.189.43.0/24 | 256 | ARIN |  US | 30th Jun 1992 |
| 192.189.44.0/24 | 256 | ARIN | US | 30th Jun 1992 |
| 192.189.49.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 192.189.50.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 192.189.53.0/24 | 256 | ARIN | US | 1st Jul 1992 |
| 192.189.56.0/24 | 256 | ARIN | US | 1st Jul 1992 |
| 192.189.57.0/24 | 256 | ARIN | US | 1st Jul 1992 |
| 192.189.59.0/24 | 256 | ARIN | US | 30th Jul 2015 |
| 192.189.61.0/24 | 256 | ARIN | US | 9th Jul 1992 |
| 192.189.62.0/24 | 256 | ARIN | US | 9th Jul 1992 |
| 192.189.63.0/24 | 256 | ARIN | US | 9th Jul 1992 |
| 192.189.64.0/24 | 256 | ARIN | US | 9th Jul 1992 |
| 192.189.7.0/24 | 256 | ARIN | US | 17th Jun 1992 |
| 192.189.74.0/24 | 256 | ARIN | US | 18th May 1995 |
| 192.189.77.0/24 | 256 | ARIN | US | 10th Jul 1992 |
| 192.189.79.0/24 | 256 | ARIN | US | 10th Jul 1992 |
| 192.189.80.0/24 | 256 | ARIN | US | 10th Jul 1992 |
| 192.189.83.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.84.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.86.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 192.189.87.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 192.189.88.0/24 | 256 | ARIN | US | 1st Jul 2026 |
| 192.189.91.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.92.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.93.0/24 | 256 | ARIN | US | 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 |