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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through RIPE NCC, largest first.
Unannounced blocks registered through RIPE NCC
25,296 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 194.153.154.128/25 | 128 | RIPE NCC |  NO | 21st Aug 2002 |
| 194.153.155.0/24 | 256 | RIPE NCC |  NL | 22nd Nov 2019 |
| 194.153.156.0/26 | 64 | RIPE NCC |  DK | 14th Jan 2002 |
| 194.153.156.128/25 | 128 | RIPE NCC |  CY | 14th Sept 2012 |
| 194.153.156.64/26 | 64 | RIPE NCC | CY | 14th Sept 2012 |
| 194.153.157.0/26 | 64 | RIPE NCC |  SE | 15th Oct 2025 |
| 194.153.157.128/27 | 32 | RIPE NCC |  CH | 21st Mar 2011 |
| 194.153.157.192/26 | 64 | RIPE NCC | CY | 14th Sept 2012 |
| 194.153.157.64/26 | 64 | RIPE NCC | SE | 15th Oct 2025 |
| 194.153.158.0/26 | 64 | RIPE NCC |  DE | 7th Nov 2025 |
| 194.153.158.64/26 | 64 | RIPE NCC | DE | 12th Nov 2025 |
| 194.153.159.0/26 | 64 | RIPE NCC |  PL | 22nd Aug 2002 |
| 194.153.159.128/26 | 64 | RIPE NCC |  GB | 20th Nov 2025 |
| 194.153.159.192/26 | 64 | RIPE NCC | DE | 9th Dec 2025 |
| 194.153.159.64/26 | 64 | RIPE NCC |  FI | 30th Nov 2010 |
| 194.153.160.0/21 | 2k | RIPE NCC | DE | 31st Mar 2000 |
| 194.153.170.0/24 | 256 | RIPE NCC | NL | 22nd Nov 2019 |
| 194.153.184.0/24 | 256 | RIPE NCC | GB | 12th Mar 2012 |
| 194.153.185.0/24 | 256 | RIPE NCC | NL | 22nd Nov 2019 |
| 194.153.212.0/23 | 512 | RIPE NCC |  IT | 9th May 2000 |
| 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 |
| 194.164.136.0/22 | 1k | RIPE NCC |  TR | 7th Mar 1996 |