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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 167.51.0.0/16 | 65.5k | ARIN |  CA | 25th Mar 1993 |
| 167.52.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.53.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.54.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.55.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.67.0.0/16 | 65.5k | ARIN |  US | 12th Sept 2018 |
| 167.69.0.0/16 | 65.5k | ARIN | US | 7th May 1993 |
| 167.70.0.0/16 | 65.5k | ARIN | US | 7th May 1993 |
| 167.74.0.0/18 | 16.4k | ARIN | CA | 11th May 1993 |
| 167.74.64.0/20 | 4.1k | ARIN | CA | 11th May 1993 |
| 167.74.96.0/19 | 8.2k | ARIN | CA | 11th May 1993 |
| 167.76.0.0/16 | 65.5k | ARIN | US | 11th May 1993 |
| 167.77.128.0/18 | 16.4k | ARIN | US | 11th May 1993 |
| 167.81.0.0/16 | 65.5k | RIPE NCC |  NL | 12th May 1993 |
| 167.84.0.0/16 | 65.5k | ARIN | US | 14th May 1993 |
| 167.85.0.0/16 | 65.5k | ARIN | US | 14th May 1993 |
| 167.86.64.0/23 | 512 | ARIN | US | 14th May 1993 |
| 167.87.0.0/16 | 65.5k | RIPE NCC |  DE | 17th 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 |
| 167.94.170.0/23 | 512 | RIPE NCC | CA | 21st May 1993 |
| 167.94.172.0/23 | 512 | RIPE NCC | CA | 21st May 1993 |