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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,702 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 91.195.242.0/23 | 512 | RIPE NCC |  DE | 25th Oct 2007 |
| 91.195.250.0/23 | 512 | RIPE NCC |  PL | 29th Oct 2007 |
| 91.195.32.0/23 | 512 | RIPE NCC |  SE | 14th Aug 2007 |
| 91.195.42.0/23 | 512 | RIPE NCC | PL | 21st Aug 2007 |
| 91.195.48.0/23 | 512 | RIPE NCC | DE | 23rd Aug 2007 |
| 91.195.6.0/23 | 512 | RIPE NCC |  RO | 6th Aug 2007 |
| 91.195.82.0/23 | 512 | RIPE NCC |  GB | 3rd Sept 2007 |
| 91.196.116.0/22 | 1k | RIPE NCC | GB | 11th Jun 2007 |
| 91.196.128.0/22 | 1k | RIPE NCC |  ES | 12th Jun 2007 |
| 91.196.16.0/22 | 1k | RIPE NCC |  IT | 18th Apr 2018 |
| 91.196.220.0/22 | 1k | RIPE NCC | DE | 26th Jun 2018 |
| 91.196.60.0/22 | 1k | RIPE NCC |  RU | 14th Oct 2009 |
| 91.196.88.0/22 | 1k | RIPE NCC |  UA | 1st Jun 2007 |
| 91.197.12.0/22 | 1k | RIPE NCC |  CY | 12th Jul 2007 |
| 91.197.183.0/24 | 256 | RIPE NCC | RU | 10th Sept 2007 |
| 91.197.212.0/22 | 1k | RIPE NCC | RU | 14th Sept 2007 |
| 91.197.236.0/22 | 1k | RIPE NCC | RU | 18th Sept 2007 |
| 91.197.244.0/23 | 512 | RIPE NCC | RO | 19th Sept 2007 |
| 91.197.246.0/24 | 256 | RIPE NCC | RO | 19th Sept 2007 |
| 91.197.36.0/22 | 1k | RIPE NCC | RO | 18th Apr 2018 |
| 91.197.44.0/23 | 512 | RIPE NCC |  CZ | 23rd May 2012 |
| 91.197.80.0/22 | 1k | RIPE NCC | UA | 8th Aug 2007 |
| 91.198.111.0/24 | 256 | RIPE NCC | PL | 13th Sept 2007 |
| 91.198.124.0/24 | 256 | RIPE NCC |  TR | 18th Sept 2007 |
| 91.198.127.0/24 | 256 | RIPE NCC |  EE | 31st Mar 2010 |
| 91.198.128.0/24 | 256 | RIPE NCC |  AT | 26th May 2025 |
| 91.198.13.0/24 | 256 | RIPE NCC | GB | 22nd Jun 2007 |
| 91.198.140.0/24 | 256 | RIPE NCC | UA | 20th Sept 2007 |
| 91.198.142.0/24 | 256 | RIPE NCC | DE | 2nd Nov 2026 |
| 91.198.151.0/24 | 256 | RIPE NCC |  NL | 25th Sept 2007 |
| 91.198.152.0/24 | 256 | RIPE NCC | NL | 25th Sept 2007 |
| 91.198.165.0/24 | 256 | RIPE NCC | DE | 1st Oct 2007 |
| 91.198.174.0/24 | 256 | RIPE NCC |  US | 2nd Oct 2007 |
| 91.198.176.0/24 | 256 | RIPE NCC |  NO | 2nd Oct 2007 |
| 91.198.18.0/24 | 256 | RIPE NCC |  AE | 18th Jun 2026 |
| 91.198.181.0/24 | 256 | RIPE NCC |  BG | 16th Jun 2009 |
| 91.198.184.0/24 | 256 | RIPE NCC | RU | 4th Oct 2007 |
| 91.198.189.0/24 | 256 | RIPE NCC | DE | 14th Sept 2011 |
| 91.198.212.0/24 | 256 | RIPE NCC | RU | 18th Oct 2007 |
| 91.198.22.0/24 | 256 | RIPE NCC | SE | 26th Jun 2007 |
| 91.198.222.0/24 | 256 | RIPE NCC | PL | 25th Oct 2007 |
| 91.198.223.0/24 | 256 | RIPE NCC | SE | 25th Oct 2007 |
| 91.198.226.0/24 | 256 | RIPE NCC | PL | 26th Oct 2007 |
| 91.198.235.0/24 | 256 | RIPE NCC | UA | 29th Oct 2007 |
| 91.198.253.0/24 | 256 | RIPE NCC | DE | 6th Nov 2007 |
| 91.198.5.0/24 | 256 | RIPE NCC |  IL | 19th Jun 2007 |
| 91.198.6.0/24 | 256 | RIPE NCC |  CH | 20th Jun 2007 |
| 91.198.62.0/24 | 256 | RIPE NCC |  SA | 28th Aug 2007 |
| 91.198.69.0/24 | 256 | RIPE NCC | RU | 29th Aug 2007 |
| 91.198.7.0/24 | 256 | RIPE NCC |  HU | 20th Jun 2007 |