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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 194.104.150.0/23 | 512 | RIPE NCC |  NL | 20th Feb 1995 |
| 194.104.159.0/24 | 256 | RIPE NCC | NL | 26th May 1995 |
| 194.104.160.0/20 | 4.1k | RIPE NCC | NL | 18th Dec 1994 |
| 194.104.176.0/21 | 2k | RIPE NCC | NL | 18th Dec 1994 |
| 194.104.184.0/24 | 256 | RIPE NCC | NL | 18th Dec 1994 |
| 194.104.185.0/24 | 256 | RIPE NCC | NL | 15th Feb 1995 |
| 194.104.231.0/24 | 256 | RIPE NCC |  NO | 1st Oct 2021 |
| 194.104.88.0/23 | 512 | RIPE NCC | NL | 2nd Dec 1994 |
| 194.104.95.0/24 | 256 | RIPE NCC |  JO | 9th Sept 2025 |
| 194.104.96.0/24 | 256 | RIPE NCC | NL | 2nd Dec 1994 |
| 194.105.0.0/24 | 256 | RIPE NCC |  RO | 15th Jan 2001 |
| 194.105.18.0/24 | 256 | RIPE NCC | RO | 15th Jan 2001 |
| 194.105.19.0/24 | 256 | RIPE NCC | RO | 15th Jan 2001 |
| 194.105.2.0/24 | 256 | RIPE NCC | RO | 15th Jan 2001 |
| 194.105.22.0/23 | 512 | RIPE NCC | RO | 15th Jan 2001 |
| 194.105.3.0/24 | 256 | RIPE NCC | RO | 15th Jan 2001 |
| 194.106.202.0/23 | 512 | RIPE NCC |  IE | 29th Oct 2019 |
| 194.106.207.0/24 | 256 | RIPE NCC |  GB | 14th Apr 2023 |
| 194.106.220.0/23 | 512 | RIPE NCC | GB | 10th May 2004 |
| 194.107.132.0/22 | 1k | RIPE NCC |  AT | 10th Jan 1995 |
| 194.107.145.0/24 | 256 | RIPE NCC | AT | 9th Feb 1995 |
| 194.107.146.0/23 | 512 | RIPE NCC | AT | 9th Feb 1995 |
| 194.107.16.0/24 | 256 | RIPE NCC | GB | 9th Jul 2007 |
| 194.107.167.0/24 | 256 | RIPE NCC | AT | 1st Mar 1995 |
| 194.107.168.0/21 | 2k | RIPE NCC | AT | 16th Feb 1995 |
| 194.107.204.0/22 | 1k | RIPE NCC |  DE | 23rd May 2018 |
| 194.107.208.0/20 | 4.1k | RIPE NCC | AT | 6th Mar 1995 |
| 194.107.229.0/24 | 256 | RIPE NCC |  TR | 22nd Nov 2019 |
| 194.107.48.0/22 | 1k | RIPE NCC | AT | 10th Nov 1994 |
| 194.107.52.0/22 | 1k | RIPE NCC | DE | 21st Nov 1994 |
| 194.107.72.0/22 | 1k | RIPE NCC |  CZ | 1st Aug 2018 |
| 194.109.0.0/16 | 65.5k | RIPE NCC | NL | 13th May 1996 |
| 194.11.0.0/20 | 4.1k | RIPE NCC |  CH | 1st Sept 1993 |
| 194.11.112.0/20 | 4.1k | RIPE NCC | CH | 1st Sept 1993 |
| 194.11.18.0/24 | 256 | RIPE NCC | GB | 2nd Jun 2008 |
| 194.11.204.0/23 | 512 | RIPE NCC | CH | 1st Sept 1993 |
| 194.11.22.0/24 | 256 | RIPE NCC |  PL | 3rd Jun 2008 |
| 194.11.227.0/24 | 256 | RIPE NCC | GB | 1st Sept 1993 |
| 194.11.230.0/23 | 512 | RIPE NCC | NL | 18th Oct 2019 |
| 194.11.234.0/23 | 512 | RIPE NCC | NL | 18th Oct 2019 |
| 194.11.240.0/23 | 512 | RIPE NCC | CH | 1st Sept 1993 |
| 194.11.30.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 194.11.31.0/24 | 256 | RIPE NCC | CH | 1st Sept 1993 |
| 194.11.88.0/21 | 2k | RIPE NCC | CH | 1st Sept 1993 |
| 194.11.96.0/20 | 4.1k | RIPE NCC | CH | 1st Sept 1993 |
| 194.110.1.0/24 | 256 | RIPE NCC | TR | 22nd Nov 2019 |
| 194.110.117.0/24 | 256 | RIPE NCC | GB | 22nd Nov 2019 |
| 194.110.128.0/24 | 256 | RIPE NCC | CH | 4th Apr 2007 |
| 194.110.132.0/24 | 256 | RIPE NCC | GB | 22nd Nov 2019 |
| 194.110.143.0/24 | 256 | RIPE NCC | DE | 22nd Nov 2019 |