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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 193.28.154.0/24 | 256 | RIPE NCC |  GB | 23rd Jul 2004 |
| 193.28.201.0/24 | 256 | RIPE NCC | GB | 22nd Mar 2004 |
| 193.28.252.0/23 | 512 | RIPE NCC | GB | 7th Oct 2019 |
| 193.28.45.0/24 | 256 | RIPE NCC | GB | 13th Feb 2004 |
| 193.29.108.0/22 | 1k | RIPE NCC | GB | 10th Sept 2018 |
| 193.29.128.0/23 | 512 | RIPE NCC | GB | 7th Oct 2019 |
| 193.29.160.0/20 | 4.1k | RIPE NCC | GB | 28th Jul 1993 |
| 193.29.178.0/23 | 512 | RIPE NCC | GB | 7th Oct 2019 |
| 193.29.6.0/23 | 512 | RIPE NCC | GB | 7th Oct 2019 |
| 193.3.26.0/24 | 256 | RIPE NCC | GB | 17th May 2021 |
| 193.3.43.0/24 | 256 | RIPE NCC | GB | 1st Sept 1993 |
| 193.3.46.0/24 | 256 | RIPE NCC | GB | 3rd Sept 2020 |
| 193.30.232.0/22 | 1k | RIPE NCC | GB | 3rd Feb 2004 |
| 193.32.106.0/23 | 512 | RIPE NCC | GB | 21st Oct 1992 |
| 193.32.108.0/23 | 512 | RIPE NCC | GB | 21st Oct 1992 |
| 193.32.111.0/24 | 256 | RIPE NCC | GB | 21st Oct 1992 |
| 193.32.17.0/24 | 256 | RIPE NCC | GB | 21st Aug 1992 |
| 193.32.24.0/22 | 1k | RIPE NCC | GB | 21st Aug 1992 |
| 193.32.250.0/23 | 512 | RIPE NCC | GB | 27th Nov 1992 |
| 193.32.252.0/23 | 512 | RIPE NCC | GB | 27th Nov 1992 |
| 193.32.254.0/24 | 256 | RIPE NCC | GB | 28th Nov 1992 |
| 193.32.255.0/24 | 256 | RIPE NCC | GB | 20th Apr 1995 |
| 193.32.39.0/24 | 256 | RIPE NCC | GB | 8th Jun 2007 |
| 193.32.45.0/24 | 256 | RIPE NCC | GB | 11th Sept 1992 |
| 193.32.6.0/23 | 512 | RIPE NCC | GB | 21st Dec 1994 |
| 193.32.82.0/24 | 256 | RIPE NCC | GB | 4th May 1994 |
| 193.32.83.0/24 | 256 | RIPE NCC | GB | 4th May 1994 |
| 193.32.88.0/22 | 1k | RIPE NCC | GB | 29th Sept 1992 |
| 193.33.49.0/24 | 256 | RIPE NCC | GB | 5th Feb 2007 |
| 193.34.134.0/23 | 512 | RIPE NCC | GB | 29th Jun 2010 |
| 193.34.146.0/23 | 512 | RIPE NCC | GB | 20th Oct 2006 |
| 193.34.195.0/25 | 128 | RIPE NCC | GB | 3rd Mar 2008 |
| 193.35.162.0/23 | 512 | RIPE NCC | GB | 3rd Aug 1994 |
| 193.35.164.0/22 | 1k | RIPE NCC | GB | 3rd Aug 1994 |
| 193.35.168.0/21 | 2k | RIPE NCC | GB | 3rd Aug 1994 |
| 193.35.176.0/22 | 1k | RIPE NCC | GB | 3rd Aug 1994 |
| 193.35.180.0/23 | 512 | RIPE NCC | GB | 3rd Aug 1994 |
| 193.35.182.0/23 | 512 | RIPE NCC | GB | 11th Jan 1993 |
| 193.35.184.0/21 | 2k | RIPE NCC | GB | 11th Jan 1993 |
| 193.35.192.0/22 | 1k | RIPE NCC | GB | 11th Jan 1993 |
| 193.35.246.0/24 | 256 | RIPE NCC | GB | 8th Feb 1993 |
| 193.35.247.0/24 | 256 | RIPE NCC | GB | 8th Feb 1993 |
| 193.36.136.0/21 | 2k | RIPE NCC | GB | 2nd Sept 1994 |
| 193.36.16.0/20 | 4.1k | RIPE NCC | GB | 9th Feb 1993 |
| 193.36.173.0/24 | 256 | RIPE NCC | GB | 30th Mar 1993 |
| 193.36.4.0/22 | 1k | RIPE NCC | GB | 8th Feb 1993 |
| 193.36.77.0/24 | 256 | RIPE NCC | GB | 3rd Mar 1993 |
| 193.37.0.0/19 | 8.2k | RIPE NCC | GB | 31st Mar 1993 |
| 193.37.112.0/20 | 4.1k | RIPE NCC | GB | 13th May 1993 |
| 193.37.228.0/24 | 256 | RIPE NCC | GB | 28th May 1993 |