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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
30,434 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.111.219.0/24 | 256 | ARIN |  US | 19th Aug 1991 |
| 192.111.220.0/24 | 256 | ARIN | US | 19th Aug 1991 |
| 192.111.221.0/24 | 256 | ARIN | US | 19th Aug 1991 |
| 192.111.223.0/24 | 256 | ARIN | US | 21st Aug 1991 |
| 192.111.225.0/24 | 256 | ARIN | US | 21st Sept 1992 |
| 192.111.226.0/24 | 256 | ARIN | US | 21st Sept 1992 |
| 192.111.228.0/24 | 256 | ARIN | US | 23rd Aug 1991 |
| 192.111.254.0/24 | 256 | ARIN | US | 27th Aug 1991 |
| 192.111.255.0/24 | 256 | ARIN |  CA | 1st Jul 2025 |
| 192.111.28.0/23 | 512 | ARIN | US | 13th Jun 2019 |
| 192.111.30.0/24 | 256 | ARIN | US | 3rd Apr 2025 |
| 192.111.35.0/24 | 256 | ARIN | US | 4th Jun 1991 |
| 192.111.45.0/24 | 256 | ARIN | US | 7th Jun 1991 |
| 192.111.46.0/24 | 256 | ARIN | US | 7th Jun 1991 |
| 192.111.49.0/24 | 256 | ARIN | US | 7th Jun 1991 |
| 192.111.50.0/24 | 256 | ARIN | US | 7th Jun 1991 |
| 192.111.51.0/24 | 256 | ARIN | US | 7th Jun 1991 |
| 192.111.52.0/24 | 256 | ARIN | US | 7th Jun 1991 |
| 192.111.53.0/24 | 256 | ARIN | US | 7th Jun 1991 |
| 192.111.87.0/24 | 256 | ARIN | US | 11th Jun 1991 |
| 192.111.89.0/24 | 256 | ARIN | US | 11th Jun 1991 |
| 192.111.90.0/23 | 512 | ARIN | CA | 17th Jan 2020 |
| 192.111.96.0/22 | 1k | ARIN | US | 11th Aug 2020 |
| 192.112.1.0/24 | 256 | ARIN | US | 21st Jun 1991 |
| 192.112.101.0/24 | 256 | ARIN | US | 7th Aug 1991 |
| 192.112.103.0/24 | 256 | ARIN | US | 7th Aug 1991 |
| 192.112.12.0/24 | 256 | ARIN | US | 21st Jun 1991 |
| 192.112.13.0/24 | 256 | ARIN | US | 21st Jun 1991 |
| 192.112.138.0/24 | 256 | ARIN | US | 5th Sept 1991 |
| 192.112.139.0/24 | 256 | ARIN | US | 5th Sept 1991 |
| 192.112.14.0/23 | 512 | ARIN | US | 21st Jun 1991 |
| 192.112.140.0/24 | 256 | ARIN | US | 5th Sept 1991 |
| 192.112.141.0/24 | 256 | ARIN | US | 5th Sept 1991 |
| 192.112.142.0/24 | 256 | ARIN | US | 5th Sept 1991 |
| 192.112.145.0/24 | 256 | ARIN | US | 5th Sept 1991 |
| 192.112.149.0/24 | 256 | ARIN | US | 5th Sept 1991 |
| 192.112.150.0/24 | 256 | ARIN | US | 3rd Oct 2022 |
| 192.112.179.0/24 | 256 | ARIN | US | 5th Sept 1991 |
| 192.112.181.0/24 | 256 | ARIN | US | 5th Sept 1991 |
| 192.112.183.0/24 | 256 | ARIN | US | 5th Sept 1991 |
| 192.112.184.0/21 | 2k | ARIN | US | 5th Sept 1991 |
| 192.112.192.0/21 | 2k | ARIN | US | 5th Sept 1991 |
| 192.112.200.0/22 | 1k | ARIN | US | 5th Sept 1991 |
| 192.112.205.0/24 | 256 | ARIN | US | 17th Sept 1991 |
| 192.112.207.0/24 | 256 | ARIN | US | 17th Sept 1991 |
| 192.112.209.0/24 | 256 | ARIN | US | 17th Sept 1991 |
| 192.112.211.0/24 | 256 | ARIN | US | 17th Sept 1991 |
| 192.112.212.0/24 | 256 | ARIN | US | 17th Sept 1991 |
| 192.112.216.0/24 | 256 | ARIN | US | 17th Sept 1991 |
| 192.112.217.0/24 | 256 | ARIN | US | 17th Sept 1991 |