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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 194.15.146.0/24 | 256 | RIPE NCC |  ES | 20th Nov 2019 |
| 194.15.182.0/24 | 256 | RIPE NCC | ES | 20th Nov 2019 |
| 194.15.183.0/24 | 256 | RIPE NCC |  DE | 3rd Jan 1994 |
| 194.15.195.0/24 | 256 | RIPE NCC | ES | 20th Nov 2019 |
| 194.15.198.0/23 | 512 | RIPE NCC | DE | 11th Jan 1994 |
| 194.15.200.0/21 | 2k | RIPE NCC | DE | 11th Jan 1994 |
| 194.15.219.0/24 | 256 | RIPE NCC | ES | 20th Nov 2019 |
| 194.15.232.0/24 | 256 | RIPE NCC | ES | 20th Nov 2019 |
| 194.15.234.0/23 | 512 | RIPE NCC |  GB | 18th Oct 2019 |
| 194.15.238.0/23 | 512 | RIPE NCC | GB | 18th Oct 2019 |
| 194.15.252.0/22 | 1k | RIPE NCC | DE | 26th Jan 1994 |
| 194.150.124.0/22 | 1k | RIPE NCC |  RO | 30th May 2018 |
| 194.150.165.0/24 | 256 | RIPE NCC |  IR | 28th Apr 2025 |
| 194.150.180.0/23 | 512 | RIPE NCC | ES | 31st Oct 2019 |
| 194.150.198.0/23 | 512 | RIPE NCC |  CH | 17th Aug 2004 |
| 194.150.238.0/23 | 512 | RIPE NCC |  PL | 6th Jul 2004 |
| 194.150.80.0/22 | 1k | RIPE NCC |  FR | 27th May 2004 |
| 194.152.146.0/24 | 256 | RIPE NCC |  HU | 6th Feb 1996 |
| 194.152.149.0/24 | 256 | RIPE NCC | HU | 6th Feb 1996 |
| 194.152.40.0/23 | 512 | RIPE NCC | GB | 15th May 2008 |
| 194.152.48.0/23 | 512 | RIPE NCC |  IT | 20th May 2008 |
| 194.153.109.0/24 | 256 | RIPE NCC | FR | 5th Dec 1999 |
| 194.153.113.0/24 | 256 | RIPE NCC | DE | 22nd Nov 2006 |
| 194.153.130.0/24 | 256 | RIPE NCC |  NO | 19th Aug 2026 |
| 194.153.134.0/24 | 256 | RIPE NCC | PL | 19th Aug 2004 |
| 194.153.144.0/24 | 256 | RIPE NCC | GB | 24th Feb 2000 |
| 194.153.147.0/24 | 256 | RIPE NCC | DE | 4th Apr 2000 |
| 194.153.152.0/25 | 128 | RIPE NCC | DE | 7th Jan 2003 |
| 194.153.153.128/25 | 128 | RIPE NCC |  AE | 24th Jan 2011 |
| 194.153.153.64/26 | 64 | RIPE NCC | CH | 19th Sept 2025 |
| 194.153.154.0/25 | 128 | RIPE NCC | GB | 7th Jul 2010 |
| 194.153.154.128/25 | 128 | RIPE NCC | NO | 21st Aug 2002 |
| 194.153.155.0/24 | 256 | RIPE NCC |  NL | 22nd Nov 2019 |
| 194.153.156.128/25 | 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 |