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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 185.155.244.0/22 | 1k | RIPE NCC |  GB | 14th Jun 2016 |
| 185.156.164.0/22 | 1k | RIPE NCC | GB | 17th Jun 2016 |
| 185.158.76.0/22 | 1k | RIPE NCC | GB | 4th Jul 2016 |
| 185.162.100.0/22 | 1k | RIPE NCC | GB | 5th Aug 2016 |
| 185.162.252.0/22 | 1k | RIPE NCC | GB | 11th Aug 2016 |
| 185.164.196.0/22 | 1k | RIPE NCC | GB | 22nd Aug 2016 |
| 185.164.220.0/22 | 1k | RIPE NCC | GB | 23rd Aug 2016 |
| 185.165.180.0/22 | 1k | RIPE NCC | GB | 29th Aug 2016 |
| 185.166.94.0/24 | 256 | RIPE NCC | GB | 22nd Jan 2026 |
| 185.167.168.0/22 | 1k | RIPE NCC | GB | 13th Sept 2016 |
| 185.167.254.0/24 | 256 | RIPE NCC | GB | 29th Apr 2020 |
| 185.168.10.0/24 | 256 | RIPE NCC | GB | 14th Sept 2016 |
| 185.168.136.0/22 | 1k | RIPE NCC | GB | 19th Sept 2016 |
| 185.169.120.0/22 | 1k | RIPE NCC | GB | 23rd Sept 2016 |
| 185.169.168.0/22 | 1k | RIPE NCC | GB | 26th Sept 2016 |
| 185.170.100.0/22 | 1k | RIPE NCC | GB | 29th Sept 2016 |
| 185.170.152.0/24 | 256 | RIPE NCC | GB | 30th Sept 2016 |
| 185.171.188.0/22 | 1k | RIPE NCC | GB | 6th Oct 2016 |
| 185.171.201.0/24 | 256 | RIPE NCC | GB | 6th Aug 2020 |
| 185.172.244.0/22 | 1k | RIPE NCC | GB | 13th Oct 2016 |
| 185.175.66.0/24 | 256 | RIPE NCC | GB | 11th Dec 2025 |
| 185.178.100.0/22 | 1k | RIPE NCC | GB | 18th Nov 2016 |
| 185.178.188.0/22 | 1k | RIPE NCC | GB | 22nd Nov 2016 |
| 185.178.230.0/24 | 256 | RIPE NCC | GB | 23rd Nov 2016 |
| 185.178.36.0/22 | 1k | RIPE NCC | GB | 17th Nov 2016 |
| 185.180.4.0/22 | 1k | RIPE NCC | GB | 1st Dec 2016 |
| 185.184.218.0/24 | 256 | RIPE NCC | GB | 29th Jun 2021 |
| 185.185.42.0/24 | 256 | RIPE NCC | GB | 10th Jan 2017 |
| 185.185.84.0/22 | 1k | RIPE NCC | GB | 11th Jan 2017 |
| 185.186.100.0/22 | 1k | RIPE NCC | GB | 18th Jan 2017 |
| 185.186.164.0/22 | 1k | RIPE NCC | GB | 19th Jan 2017 |
| 185.188.220.0/22 | 1k | RIPE NCC | GB | 7th Feb 2017 |
| 185.189.232.0/22 | 1k | RIPE NCC | GB | 13th Feb 2017 |
| 185.19.108.0/22 | 1k | RIPE NCC | GB | 21st Feb 2013 |
| 185.19.144.0/22 | 1k | RIPE NCC | GB | 21st Feb 2013 |
| 185.190.12.0/22 | 1k | RIPE NCC | GB | 14th Feb 2017 |
| 185.190.128.0/22 | 1k | RIPE NCC | GB | 17th Feb 2017 |
| 185.190.60.0/22 | 1k | RIPE NCC | GB | 15th Feb 2017 |
| 185.192.164.0/22 | 1k | RIPE NCC | GB | 2nd Mar 2017 |
| 185.192.92.0/22 | 1k | RIPE NCC | GB | 1st Mar 2017 |
| 185.193.96.0/22 | 1k | RIPE NCC | GB | 7th Mar 2017 |
| 185.195.160.0/22 | 1k | RIPE NCC | GB | 21st Mar 2017 |
| 185.198.15.0/24 | 256 | RIPE NCC | GB | 7th Jan 2025 |
| 185.198.212.0/22 | 1k | RIPE NCC | GB | 11th Apr 2017 |
| 185.199.20.0/22 | 1k | RIPE NCC | GB | 12th Apr 2017 |
| 185.199.72.0/22 | 1k | RIPE NCC | GB | 13th Apr 2017 |
| 185.20.2.0/24 | 256 | RIPE NCC | GB | 17th Jul 2020 |
| 185.200.92.0/22 | 1k | RIPE NCC | GB | 21st Apr 2017 |
| 185.201.96.0/22 | 1k | RIPE NCC | GB | 1st May 2017 |
| 185.202.232.0/22 | 1k | RIPE NCC | GB | 10th May 2017 |