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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 194.36.23.0/24 | 256 | RIPE NCC |  GB | 10th Nov 2006 |
| 194.36.248.0/21 | 2k | RIPE NCC | GB | 6th Apr 1995 |
| 194.36.4.0/22 | 1k | RIPE NCC | GB | 10th Jan 1995 |
| 194.36.66.0/23 | 512 | RIPE NCC | GB | 3rd Feb 1995 |
| 194.36.76.0/23 | 512 | RIPE NCC | GB | 8th Feb 1995 |
| 194.36.78.0/24 | 256 | RIPE NCC | GB | 8th Feb 1995 |
| 194.36.79.0/24 | 256 | RIPE NCC | GB | 8th Feb 1995 |
| 194.4.124.0/22 | 1k | RIPE NCC | GB | 22nd Dec 1993 |
| 194.4.128.0/21 | 2k | RIPE NCC | GB | 22nd Dec 1993 |
| 194.4.136.0/22 | 1k | RIPE NCC | GB | 22nd Dec 1993 |
| 194.41.9.0/24 | 256 | RIPE NCC | GB | 18th Mar 1994 |
| 194.46.39.0/24 | 256 | RIPE NCC | GB | 28th Feb 1994 |
| 194.46.40.0/23 | 512 | RIPE NCC | GB | 28th Feb 1994 |
| 194.46.43.0/24 | 256 | RIPE NCC | GB | 28th Feb 1994 |
| 194.46.48.0/21 | 2k | RIPE NCC | GB | 28th Feb 1994 |
| 194.46.56.0/24 | 256 | RIPE NCC | GB | 28th Feb 1994 |
| 194.46.61.0/24 | 256 | RIPE NCC | GB | 28th Feb 1994 |
| 194.50.165.0/24 | 256 | RIPE NCC | GB | 13th Apr 2006 |
| 194.50.210.0/23 | 512 | RIPE NCC | GB | 1st Sept 1993 |
| 194.50.250.0/23 | 512 | RIPE NCC | GB | 23rd Oct 2019 |
| 194.50.41.0/24 | 256 | RIPE NCC | GB | 10th Mar 2006 |
| 194.53.121.0/24 | 256 | RIPE NCC | GB | 18th Oct 1994 |
| 194.54.8.0/22 | 1k | RIPE NCC | GB | 7th Nov 2005 |
| 194.56.252.0/23 | 512 | RIPE NCC | GB | 25th Oct 2019 |
| 194.6.0.0/18 | 16.4k | RIPE NCC | GB | 20th Oct 1993 |
| 194.6.235.0/24 | 256 | RIPE NCC | GB | 17th Aug 2004 |
| 194.6.244.0/24 | 256 | RIPE NCC | GB | 2nd Sept 2004 |
| 194.6.248.0/24 | 256 | RIPE NCC | GB | 3rd Sept 2004 |
| 194.6.251.0/24 | 256 | RIPE NCC | GB | 20th Nov 2019 |
| 194.6.252.0/24 | 256 | RIPE NCC | GB | 20th Nov 2019 |
| 194.6.254.0/24 | 256 | RIPE NCC | GB | 20th Nov 2019 |
| 194.6.64.0/19 | 8.2k | RIPE NCC | GB | 29th Apr 1996 |
| 194.60.128.0/22 | 1k | RIPE NCC | GB | 15th Jun 1994 |
| 194.60.144.0/20 | 4.1k | RIPE NCC | GB | 16th Jun 1994 |
| 194.60.216.0/24 | 256 | RIPE NCC | GB | 12th Jul 1994 |
| 194.60.220.0/22 | 1k | RIPE NCC | GB | 12th Jul 1994 |
| 194.60.224.0/23 | 512 | RIPE NCC | GB | 1st Jul 1994 |
| 194.61.144.0/21 | 2k | RIPE NCC | GB | 24th Aug 1994 |
| 194.61.250.0/24 | 256 | RIPE NCC | GB | 14th May 1998 |
| 194.61.78.0/24 | 256 | RIPE NCC | GB | 2nd Aug 1994 |
| 194.61.94.0/24 | 256 | RIPE NCC | GB | 5th Aug 1994 |
| 194.62.102.0/24 | 256 | RIPE NCC | GB | 9th Nov 1994 |
| 194.62.125.0/24 | 256 | RIPE NCC | GB | 15th Nov 1994 |
| 194.62.144.0/22 | 1k | RIPE NCC | GB | 15th Nov 1994 |
| 194.62.172.0/24 | 256 | RIPE NCC | GB | 23rd Nov 1994 |
| 194.62.175.0/24 | 256 | RIPE NCC | GB | 30th Nov 1994 |
| 194.62.189.0/24 | 256 | RIPE NCC | GB | 14th Dec 1994 |
| 194.62.192.0/21 | 2k | RIPE NCC | GB | 7th Dec 1994 |
| 194.62.21.0/24 | 256 | RIPE NCC | GB | 27th Sept 1994 |
| 194.62.235.0/24 | 256 | RIPE NCC | GB | 15th Dec 1994 |