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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 194.39.85.0/24 | 256 | RIPE NCC |  SI | 2nd Sept 2005 |
| 194.39.86.0/24 | 256 | RIPE NCC |  DE | 11th Mar 1994 |
| 194.39.98.0/24 | 256 | RIPE NCC | DE | 17th Mar 1994 |
| 194.4.0.0/22 | 1k | RIPE NCC |  FR | 14th Apr 1994 |
| 194.4.104.0/21 | 2k | RIPE NCC | FR | 13th Dec 1993 |
| 194.4.112.0/21 | 2k | RIPE NCC | FR | 13th Dec 1993 |
| 194.4.124.0/22 | 1k | RIPE NCC |  GB | 22nd Dec 1993 |
| 194.4.128.0/21 | 2k | RIPE NCC | GB | 22nd Dec 1993 |
| 194.4.136.0/22 | 1k | RIPE NCC | GB | 22nd Dec 1993 |
| 194.4.16.0/20 | 4.1k | RIPE NCC |  CH | 4th Oct 1993 |
| 194.4.168.0/22 | 1k | RIPE NCC |  EE | 18th Sept 2018 |
| 194.4.176.0/20 | 4.1k | RIPE NCC | FR | 14th Jan 1994 |
| 194.4.192.0/20 | 4.1k | RIPE NCC | FR | 14th Jan 1994 |
| 194.4.248.0/21 | 2k | RIPE NCC | FR | 11th Aug 1994 |
| 194.4.32.0/21 | 2k | RIPE NCC | CH | 4th Oct 1993 |
| 194.4.4.0/23 | 512 | RIPE NCC | FR | 14th Apr 1994 |
| 194.4.44.0/22 | 1k | RIPE NCC |  SE | 20th Jul 2018 |
| 194.4.6.0/24 | 256 | RIPE NCC | FR | 14th Apr 1994 |
| 194.40.192.0/21 | 2k | RIPE NCC | CH | 1st Sept 1993 |
| 194.40.212.0/22 | 1k | RIPE NCC | CH | 1st Sept 1993 |
| 194.40.216.0/21 | 2k | RIPE NCC | CH | 1st Sept 1993 |
| 194.40.224.0/21 | 2k | RIPE NCC | CH | 1st Sept 1993 |
| 194.40.249.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 194.41.10.0/23 | 512 | RIPE NCC |  BG | 22nd Oct 2019 |
| 194.41.32.0/22 | 1k | RIPE NCC |  DK | 17th May 2018 |
| 194.41.57.0/24 | 256 | RIPE NCC | DE | 18th Aug 1994 |
| 194.41.63.0/24 | 256 | RIPE NCC |  US | 3rd Jan 1995 |
| 194.41.64.0/19 | 8.2k | RIPE NCC | CH | 13th Oct 1994 |
| 194.41.9.0/24 | 256 | RIPE NCC | GB | 18th Mar 1994 |
| 194.41.96.0/20 | 4.1k | RIPE NCC |  BE | 1st Jun 1994 |
| 194.42.108.0/23 | 512 | RIPE NCC | DE | 14th Jun 2004 |
| 194.42.162.0/24 | 256 | RIPE NCC | CH | 13th Feb 1998 |
| 194.42.163.0/24 | 256 | RIPE NCC |  NL | 13th Feb 1998 |
| 194.42.164.0/22 | 1k | RIPE NCC | NL | 13th Feb 1998 |
| 194.42.168.0/21 | 2k | RIPE NCC | NL | 13th Feb 1998 |
| 194.42.41.0/24 | 256 | RIPE NCC |  IT | 1st Feb 2001 |
| 194.42.42.0/24 | 256 | RIPE NCC | IT | 1st Feb 2001 |
| 194.42.43.0/24 | 256 | RIPE NCC | SI | 21st Jul 2025 |
| 194.42.46.0/24 | 256 | RIPE NCC | DE | 1st Apr 2008 |
| 194.42.47.0/26 | 64 | RIPE NCC | BG | 28th Feb 2025 |
| 194.42.47.128/25 | 128 | RIPE NCC | DE | 28th Mar 2001 |
| 194.42.47.64/26 | 64 | RIPE NCC |  QA | 3rd Mar 2025 |
| 194.42.48.0/24 | 256 | RIPE NCC | CH | 12th Oct 1999 |
| 194.42.49.0/24 | 256 | RIPE NCC | NL | 18th May 2004 |
| 194.42.55.0/27 | 32 | RIPE NCC | DE | 28th Mar 2001 |
| 194.42.55.128/27 | 32 | RIPE NCC |  CY | 14th Sept 2012 |
| 194.42.55.160/27 | 32 | RIPE NCC | SE | 28th Apr 2006 |
| 194.42.55.192/27 | 32 | RIPE NCC | DE | 8th May 2006 |
| 194.42.55.224/27 | 32 | RIPE NCC | DK | 9th Feb 2007 |
| 194.42.55.32/27 | 32 | RIPE NCC | CY | 14th Sept 2012 |