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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,738 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 91.239.91.0/24 | 256 | RIPE NCC |  GB | 16th May 2012 |
| 91.239.96.0/23 | 512 | RIPE NCC |  SI | 18th May 2012 |
| 91.240.0.0/24 | 256 | RIPE NCC | GB | 8th Aug 2012 |
| 91.240.116.0/24 | 256 | RIPE NCC |  IR | 2nd Nov 2022 |
| 91.240.178.0/24 | 256 | RIPE NCC | GB | 4th Jul 2012 |
| 91.240.192.0/24 | 256 | RIPE NCC | GB | 5th Jul 2012 |
| 91.240.195.0/24 | 256 | RIPE NCC |  NO | 5th Jul 2012 |
| 91.240.204.0/22 | 1k | RIPE NCC | NO | 5th Jul 2012 |
| 91.240.221.0/24 | 256 | RIPE NCC | GB | 5th Jul 2012 |
| 91.240.225.0/24 | 256 | RIPE NCC |  RU | 6th Jul 2012 |
| 91.240.244.0/24 | 256 | RIPE NCC |  UA | 9th Jul 2012 |
| 91.240.245.0/24 | 256 | RIPE NCC |  KG | 19th May 2023 |
| 91.240.26.0/24 | 256 | RIPE NCC |  TR | 8th Jun 2012 |
| 91.240.32.0/24 | 256 | RIPE NCC |  FR | 11th Jun 2012 |
| 91.240.34.0/24 | 256 | RIPE NCC |  DE | 11th Jun 2012 |
| 91.240.35.0/24 | 256 | RIPE NCC |  CZ | 11th Jun 2012 |
| 91.240.47.0/24 | 256 | RIPE NCC | GB | 14th Jul 2020 |
| 91.240.56.0/22 | 1k | RIPE NCC |  ES | 13th Jun 2012 |
| 91.240.71.0/24 | 256 | RIPE NCC |  HK | 12th Nov 2019 |
| 91.241.16.0/24 | 256 | RIPE NCC | RU | 11th Jul 2012 |
| 91.241.168.0/21 | 2k | RIPE NCC | CZ | 18th Jul 2012 |
| 91.241.4.0/24 | 256 | RIPE NCC | RU | 10th Jul 2012 |
| 91.241.53.0/24 | 256 | RIPE NCC |  HR | 12th Jul 2012 |
| 91.241.70.0/24 | 256 | RIPE NCC | GB | 13th Jul 2012 |
| 91.241.76.0/24 | 256 | RIPE NCC |  KZ | 25th Nov 2025 |
| 91.241.88.0/22 | 1k | RIPE NCC | RU | 16th Jul 2012 |
| 91.242.160.0/24 | 256 | RIPE NCC |  NL | 1st Aug 2012 |
| 91.242.162.0/24 | 256 | RIPE NCC | FR | 1st Aug 2012 |
| 91.242.227.0/24 | 256 | RIPE NCC |  CA | 14th Oct 2021 |
| 91.242.229.0/24 | 256 | RIPE NCC |  MD | 15th Oct 2021 |
| 91.242.231.0/24 | 256 | RIPE NCC |  PL | 15th Oct 2021 |
| 91.242.242.0/24 | 256 | RIPE NCC | NL | 15th Oct 2021 |
| 91.242.249.0/24 | 256 | RIPE NCC | DE | 15th Oct 2021 |
| 91.243.115.0/24 | 256 | RIPE NCC | PL | 12th Nov 2019 |
| 91.243.119.0/24 | 256 | RIPE NCC | IR | 5th Oct 2020 |
| 91.243.68.0/24 | 256 | RIPE NCC |  JP | 10th Jun 2025 |
| 91.243.74.0/23 | 512 | RIPE NCC | DE | 6th Aug 2012 |
| 91.244.116.0/24 | 256 | RIPE NCC | TR | 14th Aug 2012 |
| 91.244.127.0/24 | 256 | RIPE NCC | UA | 16th Aug 2012 |
| 91.244.128.0/19 | 8.2k | RIPE NCC | UA | 16th Aug 2012 |
| 91.244.182.0/24 | 256 | RIPE NCC | PL | 12th Nov 2019 |
| 91.244.226.0/24 | 256 | RIPE NCC |  SK | 28th Jul 2025 |
| 91.244.240.0/23 | 512 | RIPE NCC | RU | 17th Aug 2012 |
| 91.244.68.0/24 | 256 | RIPE NCC | NL | 26th Sept 2022 |
| 91.245.195.0/24 | 256 | RIPE NCC |  GR | 22nd Aug 2012 |
| 91.245.209.0/24 | 256 | RIPE NCC | PL | 22nd Aug 2012 |
| 91.245.212.0/24 | 256 | RIPE NCC | GB | 22nd Aug 2012 |
| 91.245.213.0/24 | 256 | RIPE NCC |  IT | 26th May 2026 |
| 91.245.219.0/24 | 256 | RIPE NCC | PL | 22nd Aug 2012 |
| 91.245.222.0/24 | 256 | RIPE NCC |  CY | 22nd Aug 2012 |