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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,871 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 78.128.116.0/23 | 512 | RIPE NCC |  BG | 5th Apr 2007 |
| 78.128.12.0/22 | 1k | RIPE NCC | BG | 5th Apr 2007 |
| 78.128.16.0/20 | 4.1k | RIPE NCC | BG | 5th Apr 2007 |
| 78.128.56.0/22 | 1k | RIPE NCC | BG | 5th Apr 2007 |
| 78.128.84.0/22 | 1k | RIPE NCC | BG | 5th Apr 2007 |
| 78.128.88.0/22 | 1k | RIPE NCC | BG | 5th Apr 2007 |
| 78.135.117.0/24 | 256 | RIPE NCC |  TR | 28th Jun 2007 |
| 78.135.118.0/23 | 512 | RIPE NCC | TR | 28th Jun 2007 |
| 78.135.120.0/21 | 2k | RIPE NCC | TR | 28th Jun 2007 |
| 78.135.78.0/24 | 256 | RIPE NCC | TR | 28th Jun 2007 |
| 78.138.108.0/22 | 1k | RIPE NCC |  DE | 11th Jun 2007 |
| 78.142.10.0/23 | 512 | RIPE NCC | BG | 30th Jul 2007 |
| 78.143.252.0/23 | 512 | RIPE NCC |  GB | 22nd Aug 2007 |
| 78.153.96.0/19 | 8.2k | RIPE NCC |  HU | 5th Oct 2009 |
| 78.159.132.0/22 | 1k | RIPE NCC |  FR | 18th Sept 2007 |
| 78.159.148.0/24 | 256 | RIPE NCC | FR | 18th Sept 2007 |
| 78.18.0.0/15 | 131k | RIPE NCC | DE | 4th Apr 2007 |
| 78.231.0.0/16 | 65.5k | RIPE NCC | FR | 15th Mar 2007 |
| 78.24.248.0/21 | 2k | RIPE NCC | FR | 2nd Sept 2010 |
| 78.24.56.0/21 | 2k | RIPE NCC |  RU | 28th Aug 2007 |
| 78.27.0.0/18 | 16.4k | RIPE NCC |  NL | 5th Sept 2007 |
| 78.31.164.0/24 | 256 | RIPE NCC | DE | 10th Jun 2024 |
| 78.31.209.0/24 | 256 | RIPE NCC |  PL | 10th Sept 2012 |
| 78.31.48.0/21 | 2k | RIPE NCC | NL | 26th Sept 2007 |
| 78.40.16.0/21 | 2k | RIPE NCC |  SA | 9th Jul 2007 |
| 78.40.40.0/21 | 2k | RIPE NCC |  SE | 8th Apr 2009 |
| 78.40.96.0/21 | 2k | RIPE NCC |  BE | 13th Jul 2007 |
| 78.41.138.0/24 | 256 | RIPE NCC |  KW | 12th Jan 2024 |
| 78.41.140.0/24 | 256 | RIPE NCC | GB | 12th Jan 2024 |
| 78.41.142.0/24 | 256 | RIPE NCC | RU | 12th Jan 2024 |
| 78.41.143.0/24 | 256 | RIPE NCC | GB | 12th Jan 2024 |
| 78.41.200.0/24 | 256 | RIPE NCC | NL | 23rd Aug 2007 |
| 78.41.201.0/24 | 256 | RIPE NCC | NL | 23rd Aug 2007 |
| 78.41.202.0/24 | 256 | RIPE NCC | NL | 23rd Aug 2007 |
| 78.41.203.0/24 | 256 | RIPE NCC | NL | 23rd Aug 2007 |
| 78.41.204.0/23 | 512 | RIPE NCC | NL | 23rd Aug 2007 |
| 78.41.206.0/24 | 256 | RIPE NCC | NL | 23rd Aug 2007 |
| 78.41.32.0/21 | 2k | RIPE NCC | RU | 30th Jul 2007 |
| 78.41.56.0/24 | 256 | RIPE NCC |  UA | 17th Jan 2025 |
| 79.108.0.0/17 | 32.8k | RIPE NCC |  ES | 3rd Dec 2007 |
| 79.108.128.0/21 | 2k | RIPE NCC |  IT | 3rd Dec 2007 |
| 79.108.227.0/24 | 256 | RIPE NCC |  AE | 3rd Dec 2007 |
| 79.110.16.0/20 | 4.1k | RIPE NCC | UA | 4th Mar 2008 |
| 79.110.160.0/22 | 1k | RIPE NCC | GB | 10th Aug 2018 |
| 79.110.172.0/22 | 1k | RIPE NCC | GB | 10th Aug 2018 |
| 79.110.226.0/24 | 256 | RIPE NCC | RU | 23rd Sept 2021 |
| 79.110.232.0/24 | 256 | RIPE NCC | DE | 23rd Sept 2021 |
| 79.135.100.0/22 | 1k | RIPE NCC | GB | 31st Oct 2007 |
| 79.135.108.0/22 | 1k | RIPE NCC |  MT | 31st Oct 2007 |
| 79.137.133.0/24 | 256 | RIPE NCC | RU | 18th Oct 2007 |