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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 194.153.215.0/25 | 128 | RIPE NCC |  FR | 17th May 2000 |
| 194.153.215.128/25 | 128 | RIPE NCC | FR | 27th Nov 2009 |
| 194.153.220.0/22 | 1k | RIPE NCC |  AT | 16th Dec 1999 |
| 194.153.233.0/24 | 256 | RIPE NCC |  RO | 9th May 2000 |
| 194.153.234.0/23 | 512 | RIPE NCC | RO | 9th May 2000 |
| 194.153.241.0/24 | 256 | RIPE NCC | RO | 9th May 2000 |
| 194.153.242.0/23 | 512 | RIPE NCC | RO | 9th May 2000 |
| 194.153.248.0/24 | 256 | RIPE NCC | RO | 9th May 2000 |
| 194.153.78.0/24 | 256 | RIPE NCC |  NL | 11th Jan 2005 |
| 194.153.81.0/24 | 256 | RIPE NCC |  GR | 8th Oct 1999 |
| 194.153.82.0/24 | 256 | RIPE NCC | GR | 8th Oct 1999 |
| 194.153.83.0/24 | 256 | RIPE NCC |  CH | 17th Nov 2009 |
| 194.153.84.0/24 | 256 | RIPE NCC |  SE | 26th Oct 1999 |
| 194.153.99.0/24 | 256 | RIPE NCC | NL | 22nd Nov 2019 |
| 194.156.144.0/24 | 256 | RIPE NCC | NL | 22nd Nov 2019 |
| 194.156.146.0/23 | 512 | RIPE NCC |  DE | 12th May 1995 |
| 194.156.166.0/23 | 512 | RIPE NCC |  RU | 1st Nov 2019 |
| 194.156.168.0/22 | 1k | RIPE NCC | DE | 24th May 1995 |
| 194.156.174.0/24 | 256 | RIPE NCC | DE | 29th May 1995 |
| 194.156.184.0/23 | 512 | RIPE NCC | RU | 1st Nov 2019 |
| 194.156.235.0/24 | 256 | RIPE NCC | AT | 22nd Nov 2019 |
| 194.156.24.0/24 | 256 | RIPE NCC | FR | 4th May 1995 |
| 194.156.240.0/21 | 2k | RIPE NCC | DE | 22nd Jun 1995 |
| 194.156.25.0/24 | 256 | RIPE NCC | DE | 4th May 1995 |
| 194.163.192.0/19 | 8.2k | RIPE NCC | DE | 16th May 1995 |
| 194.163.72.0/21 | 2k | RIPE NCC | DE | 16th May 1995 |
| 194.163.80.0/20 | 4.1k | RIPE NCC | DE | 16th May 1995 |
| 194.163.96.0/19 | 8.2k | RIPE NCC | DE | 16th May 1995 |
| 194.164.104.0/24 | 256 | RIPE NCC |  GB | 7th Mar 1996 |
| 194.164.105.0/24 | 256 | ARIN |  US | 29th Jan 2024 |
| 194.164.128.0/21 | 2k | ARIN | US | 16th May 2024 |
| 194.164.136.0/22 | 1k | RIPE NCC |  TR | 7th Mar 1996 |
| 194.164.184.0/21 | 2k | ARIN | US | 16th May 2024 |
| 194.164.208.0/21 | 2k | ARIN | US | 16th May 2024 |
| 194.164.231.0/24 | 256 | RIPE NCC | GB | 7th Mar 1996 |
| 194.164.40.0/21 | 2k | ARIN | US | 16th May 2024 |
| 194.164.97.0/24 | 256 | RIPE NCC | GB | 7th Mar 1996 |
| 194.165.10.0/23 | 512 | RIPE NCC | FR | 1st Nov 2019 |
| 194.165.30.0/23 | 512 | RIPE NCC | RU | 22nd Jan 2009 |
| 194.165.32.0/24 | 256 | RIPE NCC | SE | 16th Dec 2005 |
| 194.165.33.0/24 | 256 | RIPE NCC | FR | 28th Dec 2005 |
| 194.165.35.0/24 | 256 | RIPE NCC |  DK | 22nd Nov 2019 |
| 194.165.39.0/24 | 256 | RIPE NCC |  MD | 15th Oct 2009 |
| 194.165.4.0/23 | 512 | RIPE NCC | FR | 1st Nov 2019 |
| 194.165.40.0/24 | 256 | RIPE NCC | DE | 9th Jan 2006 |
| 194.165.42.0/24 | 256 | RIPE NCC |  ES | 17th Apr 2012 |
| 194.165.43.0/24 | 256 | RIPE NCC | FR | 11th Jan 2006 |
| 194.165.59.0/24 | 256 | RIPE NCC | MD | 9th Jan 2023 |
| 194.169.124.0/24 | 256 | RIPE NCC | NL | 1st Sept 1995 |
| 194.169.127.0/24 | 256 | RIPE NCC |  PL | 28th Nov 2006 |