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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
2,683 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.105.48.0/22 | 1k | RIPE NCC |  GB | 5th Dec 2017 |
| 103.115.96.0/24 | 256 | APNIC | GB | 15th May 2018 |
| 103.177.196.0/23 | 512 | APNIC | GB | 8th Dec 2021 |
| 103.179.202.0/23 | 512 | APNIC | GB | 18th Jan 2022 |
| 103.209.164.0/22 | 1k | RIPE NCC | GB | 19th Feb 2016 |
| 103.231.27.0/24 | 256 | APNIC | GB | 9th May 2014 |
| 103.42.230.0/23 | 512 | APNIC | GB | 28th Nov 2022 |
| 103.69.204.0/22 | 1k | APNIC | GB | 20th Jul 2016 |
| 108.60.16.0/20 | 4.1k | RIPE NCC | GB | 29th Nov 2010 |
| 109.175.207.0/24 | 256 | RIPE NCC | GB | 17th May 2010 |
| 109.175.212.0/24 | 256 | RIPE NCC | GB | 17th May 2010 |
| 109.175.223.0/24 | 256 | RIPE NCC | GB | 17th May 2010 |
| 109.175.250.0/23 | 512 | RIPE NCC | GB | 17th May 2010 |
| 109.236.160.0/24 | 256 | RIPE NCC | GB | 17th Dec 2009 |
| 109.68.196.0/22 | 1k | RIPE NCC | GB | 17th Sept 2009 |
| 109.95.240.0/21 | 2k | RIPE NCC | GB | 27th Jan 2010 |
| 116.214.122.0/24 | 256 | RIPE NCC | GB | 1st May 2007 |
| 116.214.124.0/24 | 256 | RIPE NCC | GB | 1st May 2007 |
| 119.42.44.0/22 | 1k | APNIC | GB | 20th Jul 2016 |
| 123.100.234.0/24 | 256 | RIPE NCC | GB | 10th Nov 2006 |
| 128.0.38.0/23 | 512 | RIPE NCC | GB | 14th Sept 2012 |
| 130.0.224.0/21 | 2k | RIPE NCC | GB | 19th Oct 2011 |
| 130.148.0.0/16 | 65.5k | RIPE NCC | GB | 1st Sept 1993 |
| 130.195.54.0/24 | 256 | RIPE NCC | GB | 26th Sept 1988 |
| 131.117.168.0/21 | 2k | RIPE NCC | GB | 8th Mar 2012 |
| 134.142.0.0/16 | 65.5k | RIPE NCC | GB | 1st Sept 1993 |
| 134.183.0.0/16 | 65.5k | RIPE NCC | GB | 5th Jul 1989 |
| 134.65.0.0/21 | 2k | ARIN | GB | 30th Jul 1990 |
| 134.65.173.0/24 | 256 | ARIN | GB | 30th Jul 1990 |
| 134.65.186.0/23 | 512 | ARIN | GB | 30th Jul 1990 |
| 134.65.196.0/24 | 256 | ARIN | GB | 30th Jul 1990 |
| 134.65.40.0/21 | 2k | ARIN | GB | 30th Jul 1990 |
| 135.111.0.0/16 | 65.5k | RIPE NCC | GB | 30th Apr 1996 |
| 135.114.0.0/16 | 65.5k | RIPE NCC | GB | 30th Apr 1996 |
| 135.117.0.0/16 | 65.5k | RIPE NCC | GB | 30th Apr 1996 |
| 135.118.0.0/16 | 65.5k | RIPE NCC | GB | 30th Apr 1996 |
| 136.144.64.0/19 | 8.2k | RIPE NCC | GB | 28th Aug 1989 |
| 136.148.128.0/21 | 2k | RIPE NCC | GB | 14th Apr 2004 |
| 136.148.140.0/22 | 1k | RIPE NCC | GB | 14th Apr 2004 |
| 136.148.64.0/19 | 8.2k | RIPE NCC | GB | 14th Apr 2004 |
| 136.148.96.0/21 | 2k | RIPE NCC | GB | 14th Apr 2004 |
| 137.105.0.0/16 | 65.5k | RIPE NCC | GB | 16th Nov 1989 |
| 137.218.0.0/16 | 65.5k | RIPE NCC | GB | 10th Jan 1990 |
| 137.44.128.0/17 | 32.8k | RIPE NCC | GB | 25th Oct 1989 |
| 137.44.64.0/19 | 8.2k | RIPE NCC | GB | 25th Oct 1989 |
| 137.44.96.0/20 | 4.1k | RIPE NCC | GB | 25th Oct 1989 |
| 141.105.176.0/20 | 4.1k | RIPE NCC | GB | 28th Jun 2011 |
| 141.245.0.0/16 | 65.5k | RIPE NCC | GB | 10th Aug 1990 |
| 141.8.216.0/21 | 2k | RIPE NCC | GB | 23rd Jun 2011 |
| 141.97.0.0/16 | 65.5k | RIPE NCC | GB | 24th Feb 1993 |