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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in United Kingdom
2,614 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 193.38.142.0/24 | 256 | RIPE NCC |  GB | 16th Jul 1993 |
| 193.38.49.0/24 | 256 | RIPE NCC | GB | 14th Jun 1993 |
| 193.38.52.0/24 | 256 | RIPE NCC | GB | 28th Sept 1998 |
| 193.39.11.0/24 | 256 | RIPE NCC | GB | 4th Aug 1993 |
| 193.39.224.0/22 | 1k | RIPE NCC | GB | 5th Oct 1993 |
| 193.41.0.0/23 | 512 | RIPE NCC | GB | 11th Oct 2000 |
| 193.41.152.0/23 | 512 | RIPE NCC | GB | 24th Nov 2000 |
| 193.42.144.0/24 | 256 | RIPE NCC | GB | 16th Sept 2008 |
| 193.43.0.96/27 | 32 | RIPE NCC | GB | 11th May 2012 |
| 193.43.25.0/24 | 256 | RIPE NCC | GB | 17th Dec 2004 |
| 193.46.249.0/24 | 256 | RIPE NCC | GB | 22nd Apr 1994 |
| 193.46.76.0/24 | 256 | RIPE NCC | GB | 1st Aug 2007 |
| 193.5.45.0/24 | 256 | RIPE NCC | GB | 17th Feb 2025 |
| 193.53.164.0/22 | 1k | RIPE NCC | GB | 17th Jul 2018 |
| 193.53.6.0/24 | 256 | RIPE NCC | GB | 18th Apr 1994 |
| 193.53.94.0/23 | 512 | RIPE NCC | GB | 18th Apr 1994 |
| 193.57.173.0/24 | 256 | RIPE NCC | GB | 15th Nov 2019 |
| 193.57.224.0/24 | 256 | RIPE NCC | GB | 15th Nov 2019 |
| 193.57.80.0/22 | 1k | RIPE NCC | GB | 1st May 2018 |
| 193.8.228.0/23 | 512 | RIPE NCC | GB | 4th Oct 2019 |
| 193.8.232.0/23 | 512 | RIPE NCC | GB | 4th Oct 2019 |
| 193.84.224.0/20 | 4.1k | RIPE NCC | GB | 14th Nov 1997 |
| 193.9.0.0/24 | 256 | RIPE NCC | GB | 3rd Dec 2004 |
| 193.9.1.0/24 | 256 | RIPE NCC | GB | 1st Sept 1993 |
| 193.9.2.0/23 | 512 | RIPE NCC | GB | 1st Sept 1993 |
| 193.9.26.0/24 | 256 | RIPE NCC | GB | 14th May 2024 |
| 193.93.148.0/22 | 1k | RIPE NCC | GB | 6th Apr 2006 |
| 193.93.80.0/22 | 1k | RIPE NCC | GB | 3rd May 2018 |
| 194.1.148.0/24 | 256 | RIPE NCC | GB | 9th Feb 2007 |
| 194.106.207.0/24 | 256 | RIPE NCC | GB | 14th Apr 2023 |
| 194.106.220.0/23 | 512 | RIPE NCC | GB | 10th May 2004 |
| 194.107.16.0/24 | 256 | RIPE NCC | GB | 9th Jul 2007 |
| 194.11.18.0/24 | 256 | RIPE NCC | GB | 2nd Jun 2008 |
| 194.11.227.0/24 | 256 | RIPE NCC | GB | 1st Sept 1993 |
| 194.110.117.0/24 | 256 | RIPE NCC | GB | 22nd Nov 2019 |
| 194.110.132.0/24 | 256 | RIPE NCC | GB | 22nd Nov 2019 |
| 194.110.215.0/24 | 256 | RIPE NCC | GB | 10th Apr 2007 |
| 194.110.237.0/24 | 256 | RIPE NCC | GB | 12th Apr 2007 |
| 194.110.244.0/24 | 256 | RIPE NCC | GB | 16th Apr 2007 |
| 194.110.74.0/24 | 256 | RIPE NCC | GB | 22nd Nov 2019 |
| 194.113.212.0/22 | 1k | RIPE NCC | GB | 24th May 2018 |
| 194.116.160.0/23 | 512 | RIPE NCC | GB | 19th Jan 2005 |
| 194.116.238.0/24 | 256 | RIPE NCC | GB | 3rd Sept 2025 |
| 194.117.54.128/25 | 128 | RIPE NCC | GB | 25th Nov 2005 |
| 194.117.73.0/24 | 256 | RIPE NCC | GB | 13th Oct 2025 |
| 194.126.188.0/22 | 1k | RIPE NCC | GB | 22nd Sept 2006 |
| 194.126.247.0/24 | 256 | RIPE NCC | GB | 24th Feb 2005 |
| 194.127.154.0/23 | 512 | RIPE NCC | GB | 9th Feb 1995 |
| 194.13.2.0/23 | 512 | RIPE NCC | GB | 7th Apr 1994 |
| 194.143.158.0/23 | 512 | RIPE NCC | GB | 21st Mar 2005 |