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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 194.31.82.0/23 | 512 | RIPE NCC |  GB | 27th Mar 1995 |
| 194.31.88.0/22 | 1k | RIPE NCC | GB | 15th May 2018 |
| 194.32.196.0/24 | 256 | RIPE NCC | GB | 4th Jan 1994 |
| 194.32.197.0/24 | 256 | RIPE NCC | GB | 3rd Aug 1994 |
| 194.32.198.0/23 | 512 | RIPE NCC | GB | 3rd Aug 1994 |
| 194.32.200.0/24 | 256 | RIPE NCC | GB | 4th Jan 1994 |
| 194.32.201.0/24 | 256 | RIPE NCC | GB | 4th Jan 1994 |
| 194.32.202.0/24 | 256 | RIPE NCC | GB | 4th Jan 1994 |
| 194.32.221.0/24 | 256 | RIPE NCC | GB | 1st Feb 1994 |
| 194.32.64.0/23 | 512 | RIPE NCC | GB | 11th Oct 1993 |
| 194.32.66.0/24 | 256 | RIPE NCC | GB | 11th Oct 1993 |
| 194.32.67.0/24 | 256 | RIPE NCC | GB | 6th Jul 1996 |
| 194.33.0.0/21 | 2k | RIPE NCC | GB | 4th May 1994 |
| 194.33.176.0/22 | 1k | RIPE NCC | GB | 6th Jan 1994 |
| 194.33.24.0/24 | 256 | RIPE NCC | GB | 2nd Dec 1993 |
| 194.33.25.0/24 | 256 | RIPE NCC | GB | 2nd Dec 1993 |
| 194.33.26.0/24 | 256 | RIPE NCC | GB | 2nd Dec 1993 |
| 194.33.27.0/24 | 256 | RIPE NCC | GB | 2nd Dec 1993 |
| 194.33.31.0/24 | 256 | RIPE NCC | GB | 20th Jul 1994 |
| 194.33.33.0/24 | 256 | RIPE NCC | GB | 17th Dec 1993 |
| 194.33.60.0/24 | 256 | RIPE NCC | GB | 5th Jan 1994 |
| 194.34.112.0/20 | 4.1k | RIPE NCC | GB | 15th Feb 1994 |
| 194.34.14.0/23 | 512 | RIPE NCC | GB | 4th Feb 1994 |
| 194.34.216.0/22 | 1k | RIPE NCC | GB | 8th Mar 1994 |
| 194.34.220.0/23 | 512 | RIPE NCC | GB | 8th Mar 1994 |
| 194.34.222.0/24 | 256 | RIPE NCC | GB | 8th Mar 1994 |
| 194.34.223.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.128.0/19 | 8.2k | RIPE NCC | GB | 25th Apr 1994 |
| 194.35.16.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.160.0/20 | 4.1k | RIPE NCC | GB | 4th May 1994 |
| 194.35.17.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.18.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.19.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.22.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.23.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.24.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.244.0/22 | 1k | RIPE NCC | GB | 8th Jun 1994 |
| 194.35.25.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.26.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.27.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.28.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.29.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.30.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.31.0/24 | 256 | RIPE NCC | GB | 16th Mar 1994 |
| 194.35.79.0/24 | 256 | RIPE NCC | GB | 4th May 1994 |
| 194.35.94.0/24 | 256 | RIPE NCC | GB | 13th May 1994 |
| 194.36.12.0/22 | 1k | RIPE NCC | GB | 10th Jan 1995 |
| 194.36.21.0/24 | 256 | RIPE NCC | GB | 9th Nov 2006 |
| 194.36.212.0/22 | 1k | RIPE NCC | GB | 15th Mar 1995 |
| 194.36.216.0/22 | 1k | RIPE NCC | GB | 16th Mar 1995 |