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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 194.145.148.0/23 | 512 | RIPE NCC |  GB | 27th Aug 1999 |
| 194.145.154.0/24 | 256 | RIPE NCC | GB | 2nd Nov 2004 |
| 194.146.176.0/22 | 1k | RIPE NCC | GB | 27th Oct 2003 |
| 194.146.71.0/24 | 256 | RIPE NCC | GB | 2nd Oct 1995 |
| 194.15.234.0/23 | 512 | RIPE NCC | GB | 18th Oct 2019 |
| 194.15.238.0/23 | 512 | RIPE NCC | GB | 18th Oct 2019 |
| 194.152.40.0/23 | 512 | RIPE NCC | GB | 15th May 2008 |
| 194.153.144.0/24 | 256 | RIPE NCC | GB | 24th Feb 2000 |
| 194.153.154.0/25 | 128 | RIPE NCC | GB | 7th Jul 2010 |
| 194.153.159.128/26 | 64 | RIPE NCC | GB | 20th Nov 2025 |
| 194.153.184.0/24 | 256 | RIPE NCC | GB | 12th Mar 2012 |
| 194.164.104.0/24 | 256 | RIPE NCC | GB | 7th Mar 1996 |
| 194.164.231.0/24 | 256 | RIPE NCC | GB | 7th Mar 1996 |
| 194.164.97.0/24 | 256 | RIPE NCC | GB | 7th Mar 1996 |
| 194.169.140.0/22 | 1k | RIPE NCC | GB | 20th Sept 1996 |
| 194.169.144.0/23 | 512 | RIPE NCC | GB | 20th Sept 1996 |
| 194.169.16.0/20 | 4.1k | RIPE NCC | GB | 13th Jun 1995 |
| 194.169.195.0/24 | 256 | RIPE NCC | GB | 30th Nov 2006 |
| 194.169.217.0/24 | 256 | RIPE NCC | GB | 8th Dec 2006 |
| 194.169.234.0/24 | 256 | RIPE NCC | GB | 14th Dec 2006 |
| 194.169.64.0/20 | 4.1k | RIPE NCC | GB | 4th Jun 1995 |
| 194.176.128.0/19 | 8.2k | RIPE NCC | GB | 4th Jun 1999 |
| 194.180.248.0/24 | 256 | RIPE NCC | GB | 24th Feb 2025 |
| 194.187.118.0/24 | 256 | RIPE NCC | GB | 22nd Jul 2021 |
| 194.213.28.0/24 | 256 | RIPE NCC | GB | 12th Sept 2005 |
| 194.222.0.0/19 | 8.2k | RIPE NCC | GB | 21st Dec 1995 |
| 194.222.128.0/17 | 32.8k | RIPE NCC | GB | 26th Jun 1996 |
| 194.222.32.0/19 | 8.2k | RIPE NCC | GB | 27th Mar 1996 |
| 194.222.64.0/18 | 16.4k | RIPE NCC | GB | 26th Jun 1996 |
| 194.238.128.0/17 | 32.8k | RIPE NCC | GB | 2nd Feb 1996 |
| 194.238.45.0/24 | 256 | RIPE NCC | GB | 2nd Feb 1996 |
| 194.238.46.0/24 | 256 | RIPE NCC | GB | 2nd Feb 1996 |
| 194.238.78.0/24 | 256 | RIPE NCC | GB | 2nd Feb 1996 |
| 194.242.55.0/24 | 256 | RIPE NCC | GB | 4th Feb 2004 |
| 194.246.98.0/24 | 256 | RIPE NCC | GB | 11th Feb 2004 |
| 194.28.124.0/22 | 1k | RIPE NCC | GB | 17th Nov 2010 |
| 194.28.244.0/22 | 1k | RIPE NCC | GB | 28th May 2010 |
| 194.30.166.0/24 | 256 | RIPE NCC | GB | 20th Apr 2005 |
| 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 |