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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
Browse by country
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 |
|---|---|---|---|---|
| 167.85.0.0/16 | 65.5k | ARIN |  US | 14th May 1993 |
| 167.86.64.0/23 | 512 | ARIN | US | 14th May 1993 |
| 167.88.52.0/22 | 1k | ARIN |  CA | 12th Jul 2019 |
| 167.88.57.0/24 | 256 | ARIN | US | 31st Jul 2019 |
| 167.88.96.0/20 | 4.1k | ARIN | US | 28th Mar 2014 |
| 167.94.10.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.100.0/23 | 512 | ARIN | US | 21st May 1993 |
| 167.94.103.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.107.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.111.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.115.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.118.0/23 | 512 | ARIN | US | 21st May 1993 |
| 167.94.120.0/22 | 1k | ARIN | US | 21st May 1993 |
| 167.94.124.0/23 | 512 | ARIN | US | 21st May 1993 |
| 167.94.126.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.128.0/21 | 2k | ARIN | US | 21st May 1993 |
| 167.94.13.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.136.0/23 | 512 | ARIN | US | 21st May 1993 |
| 167.94.139.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.14.0/23 | 512 | ARIN | US | 21st May 1993 |
| 167.94.140.0/22 | 1k | ARIN | US | 21st May 1993 |
| 167.94.144.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.147.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.151.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.152.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.153.0/24 | 256 | ARIN | US | 4th Nov 2021 |
| 167.94.157.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.159.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.161.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.166.0/24 | 256 | ARIN | CA | 1st Nov 2021 |
| 167.94.167.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.169.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.175.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.198.0/24 | 256 | ARIN | US | 11th Jan 2022 |
| 167.94.199.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.20.0/23 | 512 | ARIN | US | 21st May 1993 |
| 167.94.200.0/22 | 1k | ARIN | US | 21st May 1993 |
| 167.94.205.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.206.0/23 | 512 | ARIN | US | 21st May 1993 |
| 167.94.208.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.210.0/23 | 512 | ARIN | US | 21st May 1993 |
| 167.94.212.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.214.0/23 | 512 | ARIN | US | 21st May 1993 |
| 167.94.220.0/23 | 512 | ARIN | US | 21st May 1993 |
| 167.94.223.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.227.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.23.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.230.0/23 | 512 | ARIN | US | 21st May 1993 |
| 167.94.232.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.234.0/23 | 512 | ARIN | US | 21st May 1993 |