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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
2,628 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 194.79.48.0/22 | 1k | RIPE NCC |  GB | 23rd May 2018 |
| 194.8.54.0/24 | 256 | RIPE NCC | GB | 15th Oct 2003 |
| 194.9.28.0/24 | 256 | RIPE NCC | GB | 15th Aug 2006 |
| 194.9.40.0/23 | 512 | RIPE NCC | GB | 23rd Aug 2006 |
| 194.93.92.0/22 | 1k | RIPE NCC | GB | 18th Nov 1994 |
| 195.10.246.0/24 | 256 | RIPE NCC | GB | 14th Nov 1997 |
| 195.106.0.0/16 | 65.5k | RIPE NCC | GB | 11th Apr 1997 |
| 195.110.36.0/23 | 512 | RIPE NCC | GB | 10th Sept 2009 |
| 195.128.156.0/24 | 256 | RIPE NCC | GB | 11th Apr 2011 |
| 195.13.37.192/26 | 64 | RIPE NCC | GB | 20th Feb 2026 |
| 195.135.208.0/22 | 1k | RIPE NCC | GB | 11th Jul 2003 |
| 195.137.176.0/24 | 256 | RIPE NCC | GB | 22nd Sept 2005 |
| 195.144.128.0/19 | 8.2k | RIPE NCC | GB | 8th Oct 1996 |
| 195.144.27.0/24 | 256 | RIPE NCC | GB | 25th Nov 2019 |
| 195.149.103.0/24 | 256 | RIPE NCC | GB | 1st Sept 2003 |
| 195.158.231.0/24 | 256 | RIPE NCC | GB | 22nd Jan 2024 |
| 195.16.74.0/24 | 256 | RIPE NCC | GB | 22nd Jul 2021 |
| 195.162.2.0/23 | 512 | RIPE NCC | GB | 27th Nov 2008 |
| 195.18.4.0/22 | 1k | RIPE NCC | GB | 2nd Jun 2010 |
| 195.182.160.0/19 | 8.2k | RIPE NCC | GB | 10th Nov 1997 |
| 195.184.128.0/19 | 8.2k | RIPE NCC | GB | 10th Oct 1996 |
| 195.184.236.0/24 | 256 | RIPE NCC | GB | 14th Nov 1997 |
| 195.184.92.0/23 | 512 | RIPE NCC | GB | 28th Nov 2007 |
| 195.189.124.0/22 | 1k | RIPE NCC | GB | 16th Jun 2006 |
| 195.189.158.0/23 | 512 | RIPE NCC | GB | 4th May 2006 |
| 195.191.250.0/24 | 256 | RIPE NCC | GB | 20th Jan 2025 |
| 195.191.49.0/24 | 256 | RIPE NCC | GB | 15th Dec 2021 |
| 195.191.54.0/23 | 512 | RIPE NCC | GB | 6th Nov 2019 |
| 195.191.56.0/23 | 512 | RIPE NCC | GB | 6th Nov 2019 |
| 195.191.70.0/23 | 512 | RIPE NCC | GB | 13th Jan 2010 |
| 195.20.214.0/23 | 512 | RIPE NCC | GB | 23rd Jun 2010 |
| 195.200.27.0/24 | 256 | RIPE NCC | GB | 9th May 1996 |
| 195.210.54.0/23 | 512 | RIPE NCC | GB | 14th Mar 2006 |
| 195.22.150.0/23 | 512 | RIPE NCC | GB | 9th Jan 2003 |
| 195.230.122.0/24 | 256 | RIPE NCC | GB | 8th Apr 2008 |
| 195.234.244.0/22 | 1k | RIPE NCC | GB | 25th Sept 2002 |
| 195.238.225.0/24 | 256 | RIPE NCC | GB | 8th Jan 2025 |
| 195.238.237.0/24 | 256 | RIPE NCC | GB | 9th Mar 2005 |
| 195.238.249.0/24 | 256 | RIPE NCC | GB | 18th Mar 2005 |
| 195.24.230.0/23 | 512 | RIPE NCC | GB | 4th Apr 2008 |
| 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 |
| 195.245.223.0/24 | 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 |