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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 81.91.192.0/20 | 4.1k | RIPE NCC |  GB | 22nd Jul 2002 |
| 82.115.252.0/24 | 256 | RIPE NCC | GB | 19th Jan 2004 |
| 82.142.192.0/18 | 16.4k | RIPE NCC | GB | 9th Sept 2003 |
| 82.148.224.0/19 | 8.2k | RIPE NCC | GB | 1st Aug 2003 |
| 82.163.80.0/20 | 4.1k | RIPE NCC | GB | 25th Jul 2003 |
| 82.192.100.0/22 | 1k | RIPE NCC | GB | 23rd Sept 2003 |
| 82.192.96.0/23 | 512 | RIPE NCC | GB | 23rd Sept 2003 |
| 83.138.24.0/21 | 2k | RIPE NCC | GB | 11th Jan 2006 |
| 83.142.208.0/21 | 2k | RIPE NCC | GB | 20th Feb 2009 |
| 83.151.64.0/18 | 16.4k | RIPE NCC | GB | 24th Mar 2004 |
| 83.216.64.0/19 | 8.2k | RIPE NCC | GB | 25th Feb 2004 |
| 83.94.64.0/19 | 8.2k | RIPE NCC | GB | 1st Dec 2003 |
| 84.18.160.0/19 | 8.2k | RIPE NCC | GB | 12th Aug 2004 |
| 84.19.104.0/21 | 2k | RIPE NCC | GB | 25th Aug 2004 |
| 84.205.161.0/24 | 256 | RIPE NCC | GB | 3rd Feb 2005 |
| 84.38.254.0/24 | 256 | RIPE NCC | GB | 6th Jun 2023 |
| 84.38.32.0/20 | 4.1k | RIPE NCC | GB | 13th Apr 2006 |
| 84.40.48.0/21 | 2k | RIPE NCC | GB | 16th Aug 2004 |
| 85.116.0.0/19 | 8.2k | RIPE NCC | GB | 4th Mar 2005 |
| 85.119.112.0/21 | 2k | RIPE NCC | GB | 8th Jun 2005 |
| 85.12.120.0/22 | 1k | RIPE NCC | GB | 7th Mar 2005 |
| 85.12.126.0/24 | 256 | RIPE NCC | GB | 7th Mar 2005 |
| 85.12.127.0/24 | 256 | RIPE NCC | GB | 7th Mar 2005 |
| 85.12.96.0/20 | 4.1k | RIPE NCC | GB | 7th Mar 2005 |
| 85.137.212.0/23 | 512 | RIPE NCC | GB | 3rd Nov 2004 |
| 85.159.112.0/24 | 256 | RIPE NCC | GB | 30th Dec 2019 |
| 85.159.136.0/21 | 2k | RIPE NCC | GB | 21st Mar 2005 |
| 85.188.192.0/18 | 16.4k | RIPE NCC | GB | 13th Apr 2006 |
| 85.208.100.0/22 | 1k | RIPE NCC | GB | 21st Feb 2019 |
| 85.8.204.0/24 | 256 | RIPE NCC | GB | 26th Jun 2026 |
| 85.8.210.0/24 | 256 | RIPE NCC | GB | 26th Jun 2026 |
| 85.8.234.0/24 | 256 | RIPE NCC | GB | 30th Jun 2026 |
| 85.9.225.0/24 | 256 | RIPE NCC | GB | 16th Feb 2005 |
| 85.9.226.0/23 | 512 | RIPE NCC | GB | 16th Feb 2005 |
| 85.9.228.0/22 | 1k | RIPE NCC | GB | 16th Feb 2005 |
| 85.9.232.0/21 | 2k | RIPE NCC | GB | 16th Feb 2005 |
| 85.9.248.0/21 | 2k | RIPE NCC | GB | 16th Feb 2005 |
| 86.104.2.0/24 | 256 | RIPE NCC | GB | 18th Apr 2005 |
| 86.106.12.0/24 | 256 | RIPE NCC | GB | 18th Apr 2005 |
| 86.54.0.0/22 | 1k | RIPE NCC | GB | 12th May 2005 |
| 86.54.16.0/22 | 1k | RIPE NCC | GB | 12th May 2005 |
| 86.54.168.0/22 | 1k | RIPE NCC | GB | 12th May 2005 |
| 86.54.186.0/23 | 512 | RIPE NCC | GB | 12th May 2005 |
| 86.54.188.0/22 | 1k | RIPE NCC | GB | 12th May 2005 |
| 86.54.204.0/22 | 1k | RIPE NCC | GB | 12th May 2005 |
| 86.54.21.0/24 | 256 | RIPE NCC | GB | 12th May 2005 |
| 86.54.214.0/23 | 512 | RIPE NCC | GB | 12th May 2005 |
| 86.54.216.0/21 | 2k | RIPE NCC | GB | 12th May 2005 |
| 86.54.22.0/23 | 512 | RIPE NCC | GB | 12th May 2005 |
| 86.54.226.0/23 | 512 | RIPE NCC | GB | 12th May 2005 |