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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 185.245.232.0/22 | 1k | RIPE NCC |  GB | 12th Feb 2018 |
| 185.251.244.0/22 | 1k | RIPE NCC | GB | 27th Mar 2018 |
| 185.252.64.0/22 | 1k | RIPE NCC | GB | 27th Mar 2018 |
| 185.255.180.0/22 | 1k | RIPE NCC | GB | 16th Apr 2018 |
| 185.255.232.0/22 | 1k | RIPE NCC | GB | 16th Apr 2018 |
| 185.26.12.0/22 | 1k | RIPE NCC | GB | 13th May 2013 |
| 185.27.176.0/22 | 1k | RIPE NCC | GB | 3rd Jun 2013 |
| 185.29.172.0/22 | 1k | RIPE NCC | GB | 28th Jun 2013 |
| 185.29.208.0/24 | 256 | RIPE NCC | GB | 1st Oct 2024 |
| 185.31.232.0/22 | 1k | RIPE NCC | GB | 29th Jul 2013 |
| 185.31.252.0/22 | 1k | RIPE NCC | GB | 30th Jul 2013 |
| 185.32.40.0/22 | 1k | RIPE NCC | GB | 31st Jul 2013 |
| 185.34.116.0/22 | 1k | RIPE NCC | GB | 2nd Sept 2013 |
| 185.35.24.0/22 | 1k | RIPE NCC | GB | 12th Sept 2013 |
| 185.36.108.0/22 | 1k | RIPE NCC | GB | 30th Sept 2013 |
| 185.36.8.0/22 | 1k | RIPE NCC | GB | 24th Sept 2013 |
| 185.37.172.0/22 | 1k | RIPE NCC | GB | 14th Oct 2013 |
| 185.4.24.0/22 | 1k | RIPE NCC | GB | 25th Sept 2012 |
| 185.41.44.0/22 | 1k | RIPE NCC | GB | 29th Nov 2013 |
| 185.42.0.0/22 | 1k | RIPE NCC | GB | 2nd Dec 2013 |
| 185.43.216.0/22 | 1k | RIPE NCC | GB | 23rd Dec 2013 |
| 185.49.92.0/22 | 1k | RIPE NCC | GB | 3rd Mar 2014 |
| 185.50.160.0/22 | 1k | RIPE NCC | GB | 18th Mar 2014 |
| 185.50.240.0/22 | 1k | RIPE NCC | GB | 19th Mar 2014 |
| 185.51.80.0/22 | 1k | RIPE NCC | GB | 21st Mar 2014 |
| 185.52.108.0/22 | 1k | RIPE NCC | GB | 31st Mar 2014 |
| 185.55.52.0/22 | 1k | RIPE NCC | GB | 24th Apr 2014 |
| 185.55.83.0/24 | 256 | RIPE NCC | GB | 16th Jan 2025 |
| 185.56.4.0/22 | 1k | RIPE NCC | GB | 29th Apr 2014 |
| 185.57.92.0/22 | 1k | RIPE NCC | GB | 13th May 2014 |
| 185.59.176.0/22 | 1k | RIPE NCC | GB | 3rd Jun 2014 |
| 185.60.80.0/22 | 1k | RIPE NCC | GB | 6th Jun 2014 |
| 185.63.112.0/24 | 256 | RIPE NCC | GB | 27th Jun 2022 |
| 185.65.32.0/22 | 1k | RIPE NCC | GB | 22nd Jan 2019 |
| 185.67.140.0/22 | 1k | RIPE NCC | GB | 18th Aug 2014 |
| 185.67.184.0/22 | 1k | RIPE NCC | GB | 19th Aug 2014 |
| 185.68.140.0/22 | 1k | RIPE NCC | GB | 28th Aug 2014 |
| 185.69.64.0/22 | 1k | RIPE NCC | GB | 5th Sept 2014 |
| 185.7.224.0/22 | 1k | RIPE NCC | GB | 24th Oct 2012 |
| 185.70.32.0/22 | 1k | RIPE NCC | GB | 15th Sept 2014 |
| 185.74.176.0/22 | 1k | RIPE NCC | GB | 24th Oct 2014 |
| 185.76.184.0/22 | 1k | RIPE NCC | GB | 11th Nov 2014 |
| 185.77.152.0/22 | 1k | RIPE NCC | GB | 19th Nov 2014 |
| 185.79.176.0/22 | 1k | RIPE NCC | GB | 2nd Dec 2014 |
| 185.83.100.0/22 | 1k | RIPE NCC | GB | 8th Jan 2015 |
| 185.83.128.0/22 | 1k | RIPE NCC | GB | 8th Jan 2015 |
| 185.85.116.0/22 | 1k | RIPE NCC | GB | 26th Jan 2015 |
| 185.88.192.0/22 | 1k | RIPE NCC | GB | 18th Feb 2015 |
| 185.88.216.0/22 | 1k | RIPE NCC | GB | 19th Feb 2015 |
| 185.88.44.0/22 | 1k | RIPE NCC | GB | 16th Feb 2015 |