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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 91.237.50.0/24 | 256 | RIPE NCC |  PS | 20th Mar 2012 |
| 91.237.53.0/24 | 256 | RIPE NCC |  RU | 11th Nov 2019 |
| 91.237.6.0/23 | 512 | RIPE NCC |  UA | 16th Mar 2012 |
| 91.237.76.0/24 | 256 | RIPE NCC | RU | 21st Mar 2012 |
| 91.237.8.0/22 | 1k | RIPE NCC |  GB | 16th Mar 2012 |
| 91.237.90.0/24 | 256 | RIPE NCC |  SE | 21st Mar 2012 |
| 91.237.95.0/24 | 256 | RIPE NCC | SE | 22nd Mar 2012 |
| 91.237.97.0/24 | 256 | RIPE NCC | RU | 23rd Mar 2012 |
| 91.238.1.0/24 | 256 | RIPE NCC |  FR | 11th Nov 2019 |
| 91.238.107.0/24 | 256 | RIPE NCC | FR | 11th Apr 2012 |
| 91.238.113.0/24 | 256 | RIPE NCC |  SA | 11th Apr 2012 |
| 91.238.114.0/24 | 256 | RIPE NCC |  HK | 11th Nov 2019 |
| 91.238.124.0/24 | 256 | RIPE NCC |  PL | 12th Apr 2012 |
| 91.238.131.0/24 | 256 | RIPE NCC | FR | 12th Apr 2012 |
| 91.238.146.0/23 | 512 | RIPE NCC | UA | 13th Apr 2012 |
| 91.238.176.0/23 | 512 | RIPE NCC |  NL | 18th Apr 2012 |
| 91.238.18.0/24 | 256 | RIPE NCC | FR | 11th Nov 2019 |
| 91.238.213.0/24 | 256 | RIPE NCC | HK | 11th Nov 2019 |
| 91.238.214.0/23 | 512 | RIPE NCC |  IE | 25th Apr 2012 |
| 91.238.22.0/24 | 256 | RIPE NCC |  US | 3rd Apr 2012 |
| 91.238.220.0/24 | 256 | RIPE NCC | FR | 25th Apr 2012 |
| 91.238.246.0/23 | 512 | RIPE NCC | PL | 26th Apr 2012 |
| 91.238.250.0/24 | 256 | RIPE NCC |  IT | 26th Apr 2012 |
| 91.238.252.0/23 | 512 | RIPE NCC | RU | 27th Apr 2012 |
| 91.238.36.0/24 | 256 | RIPE NCC | PL | 5th Apr 2012 |
| 91.238.37.0/24 | 256 | RIPE NCC |  RO | 10th Apr 2012 |
| 91.238.50.0/24 | 256 | RIPE NCC | RO | 10th Apr 2012 |
| 91.238.6.0/23 | 512 | RIPE NCC |  RS | 3rd Apr 2012 |
| 91.238.61.0/24 | 256 | RIPE NCC | RS | 10th Apr 2012 |
| 91.238.62.0/24 | 256 | RIPE NCC | RO | 13th Feb 2023 |
| 91.238.79.0/24 | 256 | RIPE NCC | RU | 10th Apr 2012 |
| 91.238.8.0/24 | 256 | RIPE NCC |  SC | 11th Aug 2021 |
| 91.238.92.0/23 | 512 | ARIN | US | 21st Jan 2025 |
| 91.238.97.0/24 | 256 | RIPE NCC | RU | 11th Apr 2012 |
| 91.239.108.0/22 | 1k | RIPE NCC |  IR | 18th May 2012 |
| 91.239.116.0/24 | 256 | RIPE NCC |  BG | 7th Dec 2020 |
| 91.239.119.0/24 | 256 | RIPE NCC |  IQ | 9th Dec 2020 |
| 91.239.120.0/24 | 256 | RIPE NCC |  CZ | 7th Dec 2020 |
| 91.239.15.0/24 | 256 | RIPE NCC |  AT | 11th Nov 2019 |
| 91.239.188.0/24 | 256 | RIPE NCC | FR | 7th May 2024 |
| 91.239.21.0/24 | 256 | RIPE NCC |  ES | 10th May 2012 |
| 91.239.210.0/24 | 256 | RIPE NCC | IR | 31st Aug 2022 |
| 91.239.215.0/24 | 256 | RIPE NCC | RU | 25th May 2012 |
| 91.239.218.0/24 | 256 | RIPE NCC |  NO | 24th Apr 2023 |
| 91.239.219.0/24 | 256 | RIPE NCC |  BE | 24th Apr 2023 |
| 91.239.22.0/24 | 256 | RIPE NCC |  AM | 10th May 2012 |
| 91.239.24.0/24 | 256 | RIPE NCC |  DE | 11th Nov 2019 |
| 91.239.37.0/24 | 256 | RIPE NCC | AT | 11th Nov 2019 |
| 91.239.47.0/24 | 256 | RIPE NCC | BG | 11th May 2012 |
| 91.239.62.0/24 | 256 | RIPE NCC | GB | 14th May 2012 |