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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 91.241.70.0/24 | 256 | RIPE NCC |  GB | 13th Jul 2012 |
| 91.245.212.0/24 | 256 | RIPE NCC | GB | 22nd Aug 2012 |
| 91.247.73.0/24 | 256 | RIPE NCC | GB | 30th Aug 2012 |
| 91.92.160.0/23 | 512 | RIPE NCC | GB | 15th Aug 2006 |
| 91.92.196.0/24 | 256 | RIPE NCC | GB | 15th Aug 2006 |
| 92.119.172.0/22 | 1k | RIPE NCC | GB | 12th Mar 2019 |
| 92.242.128.0/19 | 8.2k | RIPE NCC | GB | 27th Dec 2007 |
| 92.42.168.0/21 | 2k | RIPE NCC | GB | 18th Dec 2007 |
| 92.43.40.0/21 | 2k | RIPE NCC | GB | 4th Jan 2008 |
| 93.174.248.0/21 | 2k | RIPE NCC | GB | 1st Jul 2008 |
| 93.187.170.0/23 | 512 | RIPE NCC | GB | 22nd Jul 2008 |
| 93.95.40.0/21 | 2k | RIPE NCC | GB | 27th Mar 2008 |
| 94.101.101.0/24 | 256 | RIPE NCC | GB | 17th Aug 2023 |
| 94.103.125.0/24 | 256 | RIPE NCC | GB | 27th Aug 2018 |
| 94.116.0.0/15 | 131k | RIPE NCC | GB | 16th Jul 2008 |
| 94.118.0.0/16 | 65.5k | RIPE NCC | GB | 16th Jul 2008 |
| 94.125.32.0/21 | 2k | RIPE NCC | GB | 20th Aug 2008 |
| 94.126.120.0/21 | 2k | RIPE NCC | GB | 19th Sept 2008 |
| 94.198.189.0/24 | 256 | RIPE NCC | GB | 29th Oct 2008 |
| 94.198.191.0/24 | 256 | RIPE NCC | GB | 29th Oct 2008 |
| 95.129.184.0/21 | 2k | RIPE NCC | GB | 23rd Feb 2009 |
| 95.131.104.0/21 | 2k | RIPE NCC | GB | 26th Mar 2009 |
| 95.141.244.0/24 | 256 | RIPE NCC | GB | 9th Jan 2024 |
| 95.141.249.0/24 | 256 | RIPE NCC | GB | 9th Jan 2024 |
| 95.143.98.0/24 | 256 | RIPE NCC | GB | 19th Jan 2026 |
| 95.143.99.0/24 | 256 | RIPE NCC | GB | 19th Jan 2026 |
| 95.172.80.0/23 | 512 | RIPE NCC | GB | 26th Feb 2009 |
| 95.175.140.0/24 | 256 | RIPE NCC | GB | 3rd Apr 2009 |
| 95.175.142.0/23 | 512 | RIPE NCC | GB | 3rd Apr 2009 |
| 95.175.151.0/24 | 256 | RIPE NCC | GB | 3rd Apr 2009 |
| 95.215.88.0/22 | 1k | RIPE NCC | GB | 26th Feb 2009 |
| 95.36.128.0/18 | 16.4k | RIPE NCC | GB | 18th Nov 2008 |
| 95.87.96.0/21 | 2k | RIPE NCC | GB | 8th Sept 2011 |