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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,239 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 194.226.140.0/23 | 512 | RIPE NCC |  RU | 3rd Jan 1996 |
| 194.226.18.0/24 | 256 | RIPE NCC | RU | 3rd Jan 1996 |
| 194.226.24.0/23 | 512 | RIPE NCC | RU | 3rd Jan 1996 |
| 194.226.36.0/24 | 256 | RIPE NCC | RU | 3rd Jan 1996 |
| 194.226.40.0/24 | 256 | RIPE NCC | RU | 3rd Jan 1996 |
| 194.226.48.0/24 | 256 | RIPE NCC | RU | 3rd Jan 1996 |
| 194.233.112.0/20 | 4.1k | RIPE NCC |  DE | 26th Jan 1996 |
| 194.233.144.0/21 | 2k | RIPE NCC | DE | 26th Jan 1996 |
| 194.233.20.0/22 | 1k | RIPE NCC | DE | 26th Jan 1996 |
| 194.233.240.0/20 | 4.1k | RIPE NCC | DE | 26th Jan 1996 |
| 194.233.28.0/22 | 1k | RIPE NCC | DE | 26th Jan 1996 |
| 194.233.32.0/20 | 4.1k | RIPE NCC | DE | 26th Jan 1996 |
| 194.233.48.0/23 | 512 | RIPE NCC | DE | 26th Jan 1996 |
| 194.233.52.0/22 | 1k | RIPE NCC | DE | 26th Jan 1996 |
| 194.233.56.0/22 | 1k | RIPE NCC | DE | 26th Jan 1996 |
| 194.238.128.0/17 | 32.8k | RIPE NCC |  GB | 2nd Feb 1996 |
| 194.238.45.0/24 | 256 | RIPE NCC |  ES | 2nd Feb 1996 |
| 194.238.46.0/24 | 256 | RIPE NCC | GB | 2nd Feb 1996 |
| 194.238.47.0/24 | 256 | RIPE NCC |  TJ | 2nd Feb 1996 |
| 194.238.78.0/24 | 256 | RIPE NCC | GB | 2nd Feb 1996 |
| 194.24.232.0/23 | 512 | RIPE NCC |  IN | 21st Oct 2019 |
| 194.242.0.0/23 | 512 | RIPE NCC |  PL | 27th Aug 2009 |
| 194.242.18.0/23 | 512 | RIPE NCC |  NL | 3rd Sept 2009 |
| 194.242.38.0/24 | 256 | RIPE NCC | NL | 22nd Nov 2019 |
| 194.242.50.0/24 | 256 | RIPE NCC |  LU | 3rd May 2001 |
| 194.242.51.0/24 | 256 | RIPE NCC |  CH | 3rd May 2001 |
| 194.242.55.0/24 | 256 | RIPE NCC | GB | 4th Feb 2004 |
| 194.246.34.0/24 | 256 | RIPE NCC |  IR | 8th May 2024 |
| 194.246.39.0/26 | 64 | RIPE NCC | PL | 19th Dec 2025 |
| 194.246.39.128/27 | 32 | RIPE NCC | DE | 17th Sept 1996 |
| 194.246.39.160/27 | 32 | RIPE NCC | DE | 17th Sept 1996 |
| 194.246.39.224/27 | 32 | RIPE NCC | NL | 31st Aug 2004 |
| 194.246.39.64/26 | 64 | RIPE NCC | NL | 13th Jan 2026 |
| 194.246.64.0/21 | 2k | RIPE NCC | DE | 21st Jun 1996 |
| 194.246.75.0/24 | 256 | RIPE NCC |  US | 31st Aug 2026 |
| 194.246.98.0/24 | 256 | RIPE NCC | GB | 11th Feb 2004 |
| 194.247.168.0/23 | 512 | RIPE NCC | RU | 12th Nov 2009 |
| 194.247.188.0/23 | 512 | RIPE NCC |  DK | 20th Nov 2009 |
| 194.247.26.0/23 | 512 | RIPE NCC |  FR | 8th Apr 2010 |
| 194.247.39.0/24 | 256 | RIPE NCC |  RS | 22nd Dec 2010 |
| 194.247.48.0/24 | 256 | RIPE NCC |  NO | 18th Jun 2012 |
| 194.247.56.0/24 | 256 | RIPE NCC |  IT | 27th Dec 2010 |
| 194.253.0.0/16 | 65.5k | RIPE NCC | NL | 8th Mar 1996 |
| 194.26.0.0/24 | 256 | RIPE NCC |  UA | 8th May 2025 |
| 194.26.1.0/24 | 256 | RIPE NCC | ES | 20th Nov 2019 |
| 194.26.130.0/24 | 256 | RIPE NCC | DE | 29th Sept 2021 |
| 194.26.140.0/24 | 256 | RIPE NCC | FR | 29th Sept 2021 |
| 194.26.150.0/23 | 512 | RIPE NCC | FR | 21st Oct 2019 |
| 194.26.156.0/23 | 512 | RIPE NCC | NL | 28th Apr 1995 |
| 194.26.160.0/22 | 1k | RIPE NCC | NL | 13th Sept 1995 |