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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 91.215.244.0/22 | 1k | RIPE NCC |  RU | 1st Sept 2009 |
| 91.215.48.0/22 | 1k | RIPE NCC |  ES | 20th Apr 2018 |
| 91.215.84.0/24 | 256 | RIPE NCC | RU | 21st Jul 2009 |
| 91.216.100.0/24 | 256 | RIPE NCC | ES | 8th Nov 2019 |
| 91.216.105.0/24 | 256 | RIPE NCC |  US | 19th May 2010 |
| 91.216.119.0/24 | 256 | RIPE NCC |  TR | 21st May 2010 |
| 91.216.131.0/24 | 256 | RIPE NCC |  NL | 27th May 2010 |
| 91.216.132.0/24 | 256 | RIPE NCC | NL | 27th May 2010 |
| 91.216.135.0/24 | 256 | RIPE NCC |  UA | 27th May 2010 |
| 91.216.137.0/24 | 256 | RIPE NCC |  GB | 28th May 2010 |
| 91.216.154.0/24 | 256 | RIPE NCC |  MT | 1st Jun 2010 |
| 91.216.162.0/24 | 256 | RIPE NCC | NL | 3rd Jun 2010 |
| 91.216.175.0/24 | 256 | RIPE NCC | RU | 10th Jun 2010 |
| 91.216.182.0/24 | 256 | RIPE NCC |  DK | 11th Jun 2010 |
| 91.216.183.0/24 | 256 | RIPE NCC | GB | 11th Jun 2010 |
| 91.216.196.0/24 | 256 | RIPE NCC | UA | 17th Jun 2010 |
| 91.216.200.0/24 | 256 | RIPE NCC | NL | 18th Jun 2010 |
| 91.216.219.0/24 | 256 | RIPE NCC | ES | 25th Jun 2010 |
| 91.216.226.0/24 | 256 | RIPE NCC | DK | 29th Jun 2010 |
| 91.216.233.0/24 | 256 | RIPE NCC |  RO | 30th Jun 2010 |
| 91.216.237.0/24 | 256 | RIPE NCC | UA | 30th Jun 2010 |
| 91.216.243.0/24 | 256 | RIPE NCC |  DE | 6th Jul 2010 |
| 91.216.244.0/24 | 256 | RIPE NCC | UA | 6th Jul 2010 |
| 91.216.251.0/24 | 256 | RIPE NCC | UA | 13th Jul 2010 |
| 91.216.29.0/24 | 256 | RIPE NCC | TR | 6th Aug 2024 |
| 91.216.3.0/24 | 256 | RIPE NCC | RU | 14th Apr 2010 |
| 91.216.31.0/24 | 256 | RIPE NCC | ES | 20th Apr 2010 |
| 91.216.40.0/24 | 256 | RIPE NCC |  CH | 6th Sept 2021 |
| 91.216.47.0/24 | 256 | RIPE NCC |  MD | 27th Apr 2010 |
| 91.216.48.0/24 | 256 | RIPE NCC | RU | 4th Aug 2011 |
| 91.216.56.0/24 | 256 | RIPE NCC |  IE | 29th Apr 2010 |
| 91.216.61.0/24 | 256 | RIPE NCC | UA | 3rd May 2010 |
| 91.216.65.0/24 | 256 | RIPE NCC |  SE | 5th Oct 2010 |
| 91.216.8.0/24 | 256 | RIPE NCC |  AT | 27th Aug 2012 |
| 91.216.82.0/24 | 256 | RIPE NCC | GB | 12th May 2010 |
| 91.216.83.0/24 | 256 | RIPE NCC | CH | 12th May 2010 |
| 91.216.84.0/23 | 512 | RIPE NCC | CH | 12th May 2010 |
| 91.216.89.0/24 | 256 | RIPE NCC | GB | 14th May 2010 |
| 91.216.97.0/24 | 256 | RIPE NCC | MD | 17th May 2010 |
| 91.216.98.0/24 | 256 | RIPE NCC |  BG | 7th Jan 2025 |
| 91.217.100.0/23 | 512 | RIPE NCC | UA | 17th Sept 2010 |
| 91.217.123.0/24 | 256 | RIPE NCC |  SI | 29th Sept 2010 |
| 91.217.129.0/24 | 256 | RIPE NCC | RU | 12th Aug 2010 |
| 91.217.162.0/24 | 256 | RIPE NCC |  HK | 8th Nov 2019 |
| 91.217.166.0/24 | 256 | RIPE NCC |  IR | 24th Sept 2025 |
| 91.217.169.0/24 | 256 | RIPE NCC |  HU | 27th Aug 2010 |
| 91.217.172.0/24 | 256 | RIPE NCC |  FR | 30th Aug 2010 |
| 91.217.191.0/24 | 256 | RIPE NCC | GB | 21st Oct 2020 |
| 91.217.204.0/24 | 256 | RIPE NCC |  PL | 9th Sept 2010 |
| 91.217.207.0/24 | 256 | RIPE NCC |  LI | 8th Mar 2023 |