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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 the most unannounced blocks, largest first.
Unannounced blocks
85,041 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 167.94.236.0/23 | 512 | ARIN | US | 21st May 1993 |
| 167.94.243.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.244.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.247.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.25.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.254.0/23 | 512 | ARIN | US | 21st May 1993 |
| 167.94.26.0/23 | 512 | ARIN | US | 21st May 1993 |
| 167.94.28.0/22 | 1k | ARIN | US | 21st May 1993 |
| 167.94.32.0/23 | 512 | ARIN | US | 21st May 1993 |
| 167.94.35.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.36.0/24 | 256 | ARIN | US | 20th Mar 2024 |
| 167.94.37.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.40.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.46.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.48.0/23 | 512 | ARIN | US | 21st May 1993 |
| 167.94.51.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.52.0/23 | 512 | ARIN | US | 3rd Nov 2021 |
| 167.94.55.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.56.0/22 | 1k | ARIN | US | 21st May 1993 |
| 167.94.6.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.60.0/23 | 512 | ARIN | US | 21st May 1993 |
| 167.94.64.0/24 | 256 | ARIN | US | 12th May 2022 |
| 167.94.65.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.78.0/24 | 256 | ARIN | US | 28th Jun 2022 |
| 167.94.79.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.8.0/23 | 512 | ARIN | US | 21st May 1993 |
| 167.94.80.0/24 | 256 | ARIN | US | 21st May 1993 |
| 167.94.88.0/23 | 512 | ARIN | US | 21st May 1993 |
| 167.94.96.0/23 | 512 | ARIN | US | 21st May 1993 |
| 167.94.98.0/24 | 256 | ARIN | US | 21st May 1993 |
| 168.0.252.0/22 | 1k | LACNIC |  BR | 11th Jan 2016 |
| 168.100.20.0/22 | 1k | ARIN | US | 25th Jun 2020 |