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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through RIPE NCC, largest first.
Unannounced blocks in United Kingdom
2,614 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.26.45.0/24 | 256 | RIPE NCC |  GB | 2nd Nov 1993 |
| 192.31.31.0/24 | 256 | RIPE NCC | GB | 21st Apr 1987 |
| 192.31.62.0/24 | 256 | RIPE NCC | GB | 6th May 1987 |
| 192.33.130.0/24 | 256 | RIPE NCC | GB | 2nd Dec 1987 |
| 192.33.16.0/24 | 256 | RIPE NCC | GB | 30th Oct 1987 |
| 192.34.19.0/24 | 256 | RIPE NCC | GB | 24th Aug 2009 |
| 192.34.50.0/24 | 256 | RIPE NCC | GB | 9th Apr 1992 |
| 192.35.108.0/24 | 256 | RIPE NCC | GB | 1st Apr 1988 |
| 192.35.138.0/24 | 256 | RIPE NCC | GB | 7th Apr 1988 |
| 192.35.197.0/24 | 256 | RIPE NCC | GB | 9th May 1988 |
| 192.41.210.0/24 | 256 | RIPE NCC | GB | 27th Jun 1988 |
| 192.42.53.0/24 | 256 | RIPE NCC | GB | 17th Aug 1988 |
| 192.42.87.0/24 | 256 | RIPE NCC | GB | 2nd Sept 1988 |
| 192.5.239.0/24 | 256 | RIPE NCC | GB | 3rd Apr 1989 |
| 192.5.254.0/24 | 256 | RIPE NCC | GB | 30th Jul 1986 |
| 192.52.161.0/24 | 256 | RIPE NCC | GB | 24th Apr 1989 |
| 192.52.253.0/24 | 256 | RIPE NCC | GB | 24th May 1989 |
| 192.54.244.0/24 | 256 | RIPE NCC | GB | 12th Nov 2019 |
| 192.54.245.0/24 | 256 | RIPE NCC | GB | 23rd Jun 1989 |
| 192.55.132.0/24 | 256 | RIPE NCC | GB | 4th Aug 1989 |
| 192.55.212.0/24 | 256 | RIPE NCC | GB | 24th Aug 1989 |
| 192.64.125.0/24 | 256 | RIPE NCC | GB | 12th Nov 2019 |
| 192.65.132.0/24 | 256 | RIPE NCC | GB | 14th Nov 1989 |
| 192.65.144.0/24 | 256 | RIPE NCC | GB | 20th Nov 1989 |
| 192.65.145.0/24 | 256 | RIPE NCC | GB | 20th Nov 1989 |
| 192.65.146.0/24 | 256 | RIPE NCC | GB | 20th Nov 1989 |
| 192.65.153.0/24 | 256 | RIPE NCC | GB | 21st Nov 1989 |
| 192.65.16.0/24 | 256 | RIPE NCC | GB | 1st Nov 1989 |
| 192.65.220.0/24 | 256 | RIPE NCC | GB | 1st Apr 1992 |
| 192.67.100.0/24 | 256 | RIPE NCC | GB | 25th Jan 1990 |
| 192.67.101.0/24 | 256 | RIPE NCC | GB | 25th Jan 1990 |
| 192.67.102.0/24 | 256 | RIPE NCC | GB | 25th Jan 1990 |
| 192.67.103.0/24 | 256 | RIPE NCC | GB | 25th Jan 1990 |
| 192.67.104.0/24 | 256 | RIPE NCC | GB | 25th Jan 1990 |
| 192.67.135.0/24 | 256 | RIPE NCC | GB | 31st Jan 1990 |
| 192.67.199.0/24 | 256 | RIPE NCC | GB | 12th Nov 2019 |
| 192.67.39.0/24 | 256 | RIPE NCC | GB | 3rd Jan 1990 |
| 192.67.47.0/24 | 256 | RIPE NCC | GB | 3rd Jan 1990 |
| 192.67.50.0/24 | 256 | RIPE NCC | GB | 3rd Jan 1990 |
| 192.67.52.0/24 | 256 | RIPE NCC | GB | 10th Jan 1990 |
| 192.67.87.0/24 | 256 | RIPE NCC | GB | 20th Jan 1990 |
| 192.67.94.0/24 | 256 | RIPE NCC | GB | 24th Jan 1990 |
| 192.68.170.0/24 | 256 | RIPE NCC | GB | 15th Mar 1990 |
| 192.68.174.0/24 | 256 | RIPE NCC | GB | 27th Oct 1992 |
| 192.68.23.0/24 | 256 | RIPE NCC | GB | 15th Feb 1990 |
| 192.73.19.0/24 | 256 | RIPE NCC | GB | 5th Jul 1990 |
| 192.73.20.0/24 | 256 | RIPE NCC | GB | 5th Jul 1990 |
| 192.73.229.0/24 | 256 | RIPE NCC | GB | 28th Aug 1990 |
| 192.76.149.0/24 | 256 | RIPE NCC | GB | 12th Nov 2019 |
| 192.77.132.0/22 | 1k | RIPE NCC | GB | 23rd Aug 1991 |