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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through RIPE NCC, largest first.
Unannounced blocks registered through RIPE NCC
25,269 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 37.220.48.0/20 | 4.1k | RIPE NCC |  FR | 3rd Apr 2012 |
| 37.228.131.0/24 | 256 | RIPE NCC |  IR | 10th Apr 2012 |
| 37.228.133.0/24 | 256 | RIPE NCC | IR | 10th Apr 2012 |
| 37.228.135.0/24 | 256 | RIPE NCC | IR | 10th Apr 2012 |
| 37.228.72.0/21 | 2k | RIPE NCC |  BE | 10th Apr 2012 |
| 37.230.188.0/22 | 1k | RIPE NCC |  RU | 11th Apr 2012 |
| 37.233.82.0/23 | 512 | RIPE NCC | RU | 13th Apr 2012 |
| 37.233.84.0/23 | 512 | RIPE NCC | RU | 13th Apr 2012 |
| 37.233.86.0/24 | 256 | RIPE NCC | RU | 13th Apr 2012 |
| 37.235.64.0/21 | 2k | RIPE NCC | RU | 16th Apr 2012 |
| 37.246.0.0/16 | 65.5k | RIPE NCC |  TR | 17th Apr 2012 |
| 37.25.40.0/22 | 1k | RIPE NCC | FR | 23rd Dec 2011 |
| 37.252.176.0/21 | 2k | RIPE NCC |  NL | 20th Apr 2012 |
| 37.252.216.0/22 | 1k | RIPE NCC |  AM | 14th Jun 2018 |
| 37.252.223.0/24 | 256 | RIPE NCC |  DE | 27th May 2021 |
| 37.26.112.0/20 | 4.1k | RIPE NCC | NL | 27th Dec 2011 |
| 37.26.144.0/21 | 2k | RIPE NCC |  IL | 27th Dec 2011 |
| 37.26.160.0/21 | 2k | RIPE NCC |  PL | 28th Dec 2011 |
| 37.32.104.0/21 | 2k | RIPE NCC |  IT | 2nd Apr 2012 |
| 37.35.72.0/21 | 2k | RIPE NCC | DE | 5th Jan 2012 |
| 37.44.128.0/19 | 8.2k | RIPE NCC |  NO | 9th Jan 2012 |
| 37.44.214.0/24 | 256 | RIPE NCC |  LV | 25th May 2021 |
| 37.44.220.0/22 | 1k | RIPE NCC |  AT | 12th Nov 2018 |
| 37.58.64.0/18 | 16.4k | RIPE NCC | NL | 16th Jan 2012 |
| 37.60.160.0/21 | 2k | RIPE NCC |  DK | 18th Jan 2012 |
| 37.72.105.0/24 | 256 | RIPE NCC | DE | 26th Jan 2012 |
| 37.72.109.0/24 | 256 | RIPE NCC |  FI | 26th Jan 2012 |
| 37.72.131.0/24 | 256 | RIPE NCC |  HK | 20th Sept 2021 |
| 37.72.139.0/24 | 256 | RIPE NCC |  SC | 21st Sept 2021 |
| 37.75.232.0/21 | 2k | RIPE NCC |  GB | 31st Jan 2012 |
| 37.77.32.0/20 | 4.1k | RIPE NCC | FR | 1st Feb 2012 |
| 37.77.64.0/20 | 4.1k | RIPE NCC |  IQ | 1st Feb 2012 |
| 37.9.128.0/21 | 2k | RIPE NCC | RU | 14th Dec 2011 |
| 37.99.208.0/21 | 2k | RIPE NCC |  IE | 8th Feb 2012 |
| 40.17.0.0/16 | 65.5k | RIPE NCC | GB | 23rd Apr 1991 |
| 40.21.0.0/16 | 65.5k | RIPE NCC | GB | 23rd Apr 1991 |
| 40.25.0.0/16 | 65.5k | RIPE NCC | GB | 23rd Apr 1991 |
| 43.226.224.0/22 | 1k | RIPE NCC |  AE | 28th Mar 2019 |
| 45.10.116.0/22 | 1k | RIPE NCC | NL | 25th Apr 2019 |
| 45.10.216.0/22 | 1k | RIPE NCC | RU | 25th Apr 2019 |
| 45.10.76.0/22 | 1k | RIPE NCC | GB | 24th Apr 2019 |
| 45.10.8.0/22 | 1k | RIPE NCC | FR | 23rd Apr 2019 |
| 45.11.120.0/22 | 1k | RIPE NCC | PL | 26th Apr 2019 |
| 45.11.144.0/22 | 1k | RIPE NCC |  GG | 29th Apr 2019 |
| 45.11.197.0/24 | 256 | RIPE NCC | FR | 25th Jan 2022 |
| 45.11.208.0/22 | 1k | RIPE NCC | FR | 29th Apr 2019 |
| 45.11.244.0/22 | 1k | RIPE NCC |  US | 30th Apr 2019 |
| 45.11.28.0/22 | 1k | RIPE NCC | NL | 26th Apr 2019 |
| 45.11.94.0/24 | 256 | RIPE NCC | RU | 26th Apr 2019 |
| 45.116.184.0/22 | 1k | RIPE NCC | NL | 8th May 2015 |