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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 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 |
| 192.77.136.0/23 | 512 | RIPE NCC | GB | 23rd Aug 1991 |
| 192.77.138.0/24 | 256 | RIPE NCC | GB | 23rd Aug 1991 |
| 192.80.46.0/24 | 256 | RIPE NCC | GB | 7th May 1990 |
| 192.81.234.0/24 | 256 | RIPE NCC | GB | 1st Jan 1984 |
| 192.81.61.0/24 | 256 | RIPE NCC | GB | 31st Aug 1995 |
| 192.81.62.0/24 | 256 | RIPE NCC | GB | 31st Aug 1995 |
| 192.82.121.0/24 | 256 | RIPE NCC | GB | 16th Jul 1990 |
| 192.82.124.0/24 | 256 | RIPE NCC | GB | 30th Jul 1990 |
| 192.83.102.0/24 | 256 | RIPE NCC | GB | 7th Sept 1990 |
| 192.83.200.0/24 | 256 | RIPE NCC | GB | 1st Apr 2005 |
| 192.83.202.0/24 | 256 | RIPE NCC | GB | 19th Sept 1990 |
| 192.84.173.0/24 | 256 | RIPE NCC | GB | 6th Nov 1990 |
| 192.84.212.0/24 | 256 | RIPE NCC | GB | 9th Nov 1990 |
| 192.84.80.0/24 | 256 | RIPE NCC | GB | 26th Oct 1990 |
| 192.84.81.0/24 | 256 | RIPE NCC | GB | 26th Oct 1990 |
| 192.84.82.0/24 | 256 | RIPE NCC | GB | 26th Oct 1990 |
| 192.84.83.0/24 | 256 | RIPE NCC | GB | 26th Oct 1990 |
| 192.84.84.0/24 | 256 | RIPE NCC | GB | 26th Oct 1990 |
| 192.86.127.0/24 | 256 | RIPE NCC | GB | 4th Aug 1993 |
| 192.86.134.0/24 | 256 | RIPE NCC | GB | 6th Dec 1990 |
| 192.86.137.0/24 | 256 | RIPE NCC | GB | 6th Dec 1990 |
| 192.86.169.0/24 | 256 | RIPE NCC | GB | 23rd Apr 1997 |
| 192.86.18.0/24 | 256 | RIPE NCC | GB | 16th Nov 1990 |
| 192.86.27.0/24 | 256 | RIPE NCC | GB | 20th Nov 1990 |
| 192.88.10.0/24 | 256 | RIPE NCC | GB | 5th Dec 1990 |
| 192.88.118.0/24 | 256 | RIPE NCC | GB | 17th Dec 1990 |
| 192.88.128.0/24 | 256 | RIPE NCC | GB | 19th Dec 1990 |
| 192.88.133.0/24 | 256 | RIPE NCC | GB | 19th Dec 1990 |
| 192.88.238.0/24 | 256 | RIPE NCC | GB | 17th Jan 1991 |
| 192.88.84.0/24 | 256 | RIPE NCC | GB | 12th Dec 1990 |
| 192.91.201.0/24 | 256 | RIPE NCC | GB | 18th Jan 1991 |
| 192.91.211.0/24 | 256 | RIPE NCC | GB | 18th Jan 1991 |
| 192.92.109.0/24 | 256 | RIPE NCC | GB | 25th Jan 1991 |
| 192.94.111.0/24 | 256 | RIPE NCC | GB | 22nd Feb 1991 |
| 192.94.112.0/22 | 1k | RIPE NCC | GB | 22nd Feb 1991 |
| 192.94.116.0/23 | 512 | RIPE NCC | GB | 22nd Feb 1991 |
| 192.94.172.0/24 | 256 | RIPE NCC | GB | 28th Feb 1991 |
| 192.94.58.0/24 | 256 | RIPE NCC | GB | 15th Feb 1991 |