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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,755 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 91.217.223.0/24 | 256 | RIPE NCC |  SI | 8th Mar 2023 |
| 91.217.23.0/24 | 256 | RIPE NCC |  DE | 25th Nov 2020 |
| 91.217.231.0/24 | 256 | RIPE NCC |  GB | 17th Sept 2010 |
| 91.217.232.0/24 | 256 | RIPE NCC | DE | 20th Sept 2010 |
| 91.217.235.0/24 | 256 | RIPE NCC |  NL | 21st Sept 2010 |
| 91.217.241.0/24 | 256 | RIPE NCC |  BG | 14th Feb 2024 |
| 91.217.74.0/24 | 256 | RIPE NCC |  RU | 9th Sept 2010 |
| 91.217.75.0/24 | 256 | RIPE NCC | RU | 9th Sept 2010 |
| 91.218.172.0/24 | 256 | RIPE NCC |  RS | 28th Jul 2010 |
| 91.218.182.0/24 | 256 | RIPE NCC |  SE | 29th Jul 2010 |
| 91.218.242.0/23 | 512 | RIPE NCC |  PL | 23rd Aug 2010 |
| 91.219.118.0/24 | 256 | RIPE NCC | GB | 6th May 2026 |
| 91.219.124.0/22 | 1k | RIPE NCC | RU | 11th Oct 2010 |
| 91.219.192.0/22 | 1k | RIPE NCC | RU | 21st Oct 2010 |
| 91.219.216.0/22 | 1k | RIPE NCC | SE | 25th Oct 2010 |
| 91.219.28.0/22 | 1k | RIPE NCC |  SK | 6th Sept 2010 |
| 91.219.36.0/22 | 1k | RIPE NCC | RU | 10th Sept 2010 |
| 91.220.0.0/24 | 256 | RIPE NCC |  IR | 11th Aug 2025 |
| 91.220.110.0/24 | 256 | RIPE NCC |  IS | 9th Nov 2011 |
| 91.220.121.0/24 | 256 | RIPE NCC |  RO | 9th Nov 2010 |
| 91.220.136.0/24 | 256 | RIPE NCC |  BE | 11th Nov 2010 |
| 91.220.144.0/24 | 256 | RIPE NCC |  MD | 12th Nov 2010 |
| 91.220.153.0/24 | 256 | RIPE NCC | NL | 17th Nov 2010 |
| 91.220.154.0/24 | 256 | RIPE NCC | BE | 17th Nov 2010 |
| 91.220.16.0/24 | 256 | RIPE NCC | DE | 2nd Jun 2026 |
| 91.220.167.0/24 | 256 | RIPE NCC | RO | 23rd Nov 2010 |
| 91.220.177.0/24 | 256 | RIPE NCC | PL | 25th Nov 2010 |
| 91.220.188.0/24 | 256 | RIPE NCC | RU | 30th Nov 2010 |
| 91.220.191.0/24 | 256 | RIPE NCC | BE | 30th Nov 2010 |
| 91.220.194.0/24 | 256 | RIPE NCC | SI | 2nd Dec 2010 |
| 91.220.195.0/24 | 256 | RIPE NCC |  JO | 2nd Dec 2010 |
| 91.220.209.0/24 | 256 | RIPE NCC |  LT | 7th Dec 2010 |
| 91.220.224.0/24 | 256 | RIPE NCC |  IE | 10th Dec 2010 |
| 91.220.225.0/24 | 256 | RIPE NCC | PL | 10th Dec 2010 |
| 91.220.227.0/24 | 256 | RIPE NCC | SE | 10th Dec 2010 |
| 91.220.236.0/24 | 256 | RIPE NCC |  GR | 13th Dec 2010 |
| 91.220.242.0/24 | 256 | RIPE NCC |  TR | 14th Dec 2010 |
| 91.220.245.0/24 | 256 | RIPE NCC |  FR | 16th Dec 2010 |
| 91.220.252.0/24 | 256 | RIPE NCC | LT | 30th Dec 2024 |
| 91.220.255.0/24 | 256 | RIPE NCC |  UA | 17th Dec 2010 |
| 91.220.30.0/24 | 256 | RIPE NCC | NL | 5th Sept 2022 |
| 91.220.32.0/24 | 256 | RIPE NCC | PL | 14th Oct 2010 |
| 91.220.36.0/24 | 256 | RIPE NCC | DE | 18th Oct 2010 |
| 91.220.46.0/24 | 256 | RIPE NCC | RU | 19th Oct 2010 |
| 91.220.47.0/24 | 256 | RIPE NCC | SE | 19th Oct 2010 |
| 91.220.49.0/24 | 256 | RIPE NCC | DE | 19th Oct 2010 |
| 91.220.6.0/24 | 256 | RIPE NCC | NL | 6th Oct 2010 |
| 91.220.64.0/24 | 256 | RIPE NCC |  CH | 22nd Oct 2010 |
| 91.220.67.0/24 | 256 | RIPE NCC | DE | 12th May 2025 |
| 91.220.72.0/24 | 256 | RIPE NCC | RO | 25th Oct 2010 |