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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in United Kingdom
2,663 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 195.242.154.0/23 | 512 | RIPE NCC |  GB | 12th Dec 2006 |
| 195.242.223.0/24 | 256 | RIPE NCC | GB | 14th Sept 2004 |
| 195.242.70.0/23 | 512 | RIPE NCC | GB | 29th Nov 2004 |
| 195.244.16.0/23 | 512 | RIPE NCC | GB | 20th Mar 2006 |
| 195.245.198.0/24 | 256 | RIPE NCC | GB | 7th Jun 2023 |
| 195.245.223.0/24 | 256 | RIPE NCC | GB | 9th Jan 2003 |
| 195.245.252.0/24 | 256 | RIPE NCC | GB | 4th Feb 2003 |
| 195.248.192.0/19 | 8.2k | RIPE NCC | GB | 10th Apr 1997 |
| 195.26.88.0/22 | 1k | RIPE NCC | GB | 19th Jul 2006 |
| 195.3.208.0/22 | 1k | RIPE NCC | GB | 30th Aug 2006 |
| 195.35.124.0/23 | 512 | RIPE NCC | GB | 8th Sept 2000 |
| 195.46.48.0/22 | 1k | RIPE NCC | GB | 14th Feb 2003 |
| 195.47.223.0/24 | 256 | RIPE NCC | GB | 25th Apr 2003 |
| 195.47.240.0/24 | 256 | RIPE NCC | GB | 14th May 2003 |
| 195.5.169.0/24 | 256 | RIPE NCC | GB | 11th Apr 2008 |
| 195.5.175.0/24 | 256 | RIPE NCC | GB | 16th Apr 2008 |
| 195.58.64.0/19 | 8.2k | RIPE NCC | GB | 13th Feb 1997 |
| 195.60.82.192/26 | 64 | RIPE NCC | GB | 2nd Mar 2010 |
| 195.60.83.192/27 | 32 | RIPE NCC | GB | 18th Jan 2011 |
| 195.60.85.0/25 | 128 | RIPE NCC | GB | 14th Sept 2006 |
| 195.60.95.128/25 | 128 | RIPE NCC | GB | 4th Jul 2006 |
| 195.62.8.0/23 | 512 | RIPE NCC | GB | 16th Jul 2004 |
| 195.66.102.0/24 | 256 | RIPE NCC | GB | 10th May 2021 |
| 195.68.206.0/23 | 512 | RIPE NCC | GB | 26th May 2003 |
| 195.68.238.0/23 | 512 | RIPE NCC | GB | 23rd Jun 2003 |
| 195.69.100.0/22 | 1k | RIPE NCC | GB | 4th Jun 2018 |
| 195.69.152.0/22 | 1k | RIPE NCC | GB | 17th Mar 2003 |
| 195.72.116.0/23 | 512 | RIPE NCC | GB | 7th Aug 2000 |
| 195.78.110.0/23 | 512 | RIPE NCC | GB | 6th Oct 2009 |
| 195.8.100.0/24 | 256 | RIPE NCC | GB | 12th Jan 2005 |
| 195.8.160.0/19 | 8.2k | RIPE NCC | GB | 11th Dec 1997 |
| 195.8.96.0/24 | 256 | RIPE NCC | GB | 12th Jan 2005 |
| 195.85.192.0/24 | 256 | RIPE NCC | GB | 8th Feb 2024 |
| 195.85.232.0/24 | 256 | RIPE NCC | GB | 27th Jun 2003 |
| 195.88.118.0/24 | 256 | RIPE NCC | GB | 25th Sept 2025 |
| 198.133.226.0/24 | 256 | RIPE NCC | GB | 30th Apr 1993 |
| 198.133.80.0/22 | 1k | RIPE NCC | GB | 9th Apr 1993 |
| 198.133.84.0/23 | 512 | RIPE NCC | GB | 9th Apr 1993 |
| 198.135.167.0/24 | 256 | RIPE NCC | GB | 18th May 1993 |
| 198.205.14.0/24 | 256 | RIPE NCC | GB | 25th Jun 1993 |
| 198.62.104.0/24 | 256 | RIPE NCC | GB | 4th Feb 1993 |
| 198.7.96.0/20 | 4.1k | RIPE NCC | GB | 26th Nov 2012 |
| 199.103.64.0/22 | 1k | ARIN | GB | 21st Jun 1994 |
| 199.103.86.0/24 | 256 | ARIN | GB | 25th Jun 1994 |
| 199.120.230.0/24 | 256 | RIPE NCC | GB | 8th Mar 1994 |
| 199.204.24.0/22 | 1k | RIPE NCC | GB | 2nd Apr 2010 |
| 199.244.145.0/24 | 256 | RIPE NCC | GB | 16th Aug 1994 |
| 2001:15e0::/32 | 4.3B × /64 | RIPE NCC | GB | 7th Oct 2003 |
| 2001:3200::/29 | 34.4B × /64 | RIPE NCC | GB | 26th Jul 2024 |
| 2001:3240::/29 | 34.4B × /64 | RIPE NCC | GB | 6th Sept 2024 |