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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,702 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 91.208.46.0/24 | 256 | RIPE NCC |  DE | 7th Nov 2019 |
| 91.208.48.0/24 | 256 | RIPE NCC | DE | 7th Nov 2019 |
| 91.208.49.0/24 | 256 | RIPE NCC |  NL | 11th Jul 2008 |
| 91.208.63.0/24 | 256 | RIPE NCC |  BG | 16th May 2012 |
| 91.208.64.0/24 | 256 | RIPE NCC | DE | 7th Nov 2019 |
| 91.208.69.0/24 | 256 | RIPE NCC |  US | 7th Nov 2019 |
| 91.208.70.0/24 | 256 | RIPE NCC |  TR | 21st Jul 2008 |
| 91.208.77.0/24 | 256 | RIPE NCC | NL | 15th May 2023 |
| 91.208.90.0/24 | 256 | RIPE NCC |  RO | 30th Jul 2008 |
| 91.208.91.0/24 | 256 | RIPE NCC | US | 30th Jul 2008 |
| 91.208.99.0/24 | 256 | RIPE NCC | DE | 1st Aug 2008 |
| 91.209.1.0/24 | 256 | RIPE NCC |  SI | 7th Apr 2010 |
| 91.209.100.0/24 | 256 | RIPE NCC |  GB | 7th Nov 2019 |
| 91.209.117.0/24 | 256 | RIPE NCC | NL | 25th Aug 2025 |
| 91.209.134.0/24 | 256 | RIPE NCC |  CH | 19th Nov 2008 |
| 91.209.142.0/24 | 256 | RIPE NCC | GB | 8th Aug 2012 |
| 91.209.144.0/24 | 256 | RIPE NCC | GB | 20th Nov 2008 |
| 91.209.15.0/24 | 256 | RIPE NCC |  FR | 13th Oct 2008 |
| 91.209.164.0/24 | 256 | RIPE NCC | NL | 1st Oct 2010 |
| 91.209.170.0/24 | 256 | RIPE NCC | CH | 2nd Dec 2008 |
| 91.209.176.0/24 | 256 | RIPE NCC |  UA | 3rd Dec 2008 |
| 91.209.187.0/24 | 256 | RIPE NCC | GB | 10th Dec 2008 |
| 91.209.200.0/24 | 256 | RIPE NCC | GB | 15th Dec 2008 |
| 91.209.204.0/24 | 256 | RIPE NCC | CH | 16th Dec 2008 |
| 91.209.208.0/24 | 256 | RIPE NCC |  RU | 6th Nov 2023 |
| 91.209.21.0/24 | 256 | RIPE NCC |  EE | 7th Nov 2019 |
| 91.209.227.0/24 | 256 | RIPE NCC |  SE | 28th Jan 2026 |
| 91.209.232.0/24 | 256 | RIPE NCC | SE | 23rd Dec 2008 |
| 91.209.241.0/24 | 256 | RIPE NCC | RO | 29th Dec 2008 |
| 91.209.252.0/24 | 256 | RIPE NCC | GB | 6th Jan 2009 |
| 91.209.41.0/24 | 256 | RIPE NCC | CH | 20th Oct 2008 |
| 91.209.43.0/24 | 256 | RIPE NCC | NL | 21st Aug 2024 |
| 91.209.44.0/24 | 256 | RIPE NCC | FR | 21st Oct 2008 |
| 91.209.47.0/24 | 256 | RIPE NCC |  GR | 21st Oct 2008 |
| 91.209.50.0/24 | 256 | RIPE NCC |  PL | 7th Nov 2019 |
| 91.209.58.0/24 | 256 | RIPE NCC | PL | 7th Nov 2019 |
| 91.209.62.0/23 | 512 | RIPE NCC | PL | 3rd Oct 2019 |
| 91.209.81.0/24 | 256 | RIPE NCC | DE | 31st Oct 2008 |
| 91.209.96.0/24 | 256 | RIPE NCC |  IR | 1st Jun 2021 |
| 91.209.99.0/24 | 256 | RIPE NCC | GB | 7th Nov 2019 |
| 91.210.124.0/24 | 256 | RIPE NCC |  CY | 10th Mar 2025 |
| 91.210.208.0/22 | 1k | RIPE NCC | GR | 17th Nov 2008 |
| 91.210.40.0/24 | 256 | RIPE NCC | PL | 1st Jun 2026 |
| 91.210.42.0/24 | 256 | RIPE NCC | SE | 1st Jun 2026 |
| 91.210.60.0/22 | 1k | RIPE NCC | SE | 15th Oct 2008 |
| 91.211.112.0/24 | 256 | RIPE NCC | TR | 28th Jan 2026 |
| 91.211.146.0/24 | 256 | RIPE NCC | GB | 8th Jan 2025 |
| 91.211.147.0/24 | 256 | RIPE NCC | CY | 8th Jan 2025 |
| 91.211.2.0/24 | 256 | RIPE NCC | RU | 30th Jun 2020 |
| 91.211.72.0/22 | 1k | RIPE NCC | NL | 5th Dec 2008 |