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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
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Countries with unannounced space registered through ARIN, largest first.
Unannounced blocks in United Kingdom
30 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 134.65.0.0/21 | 2k | ARIN |  GB | 30th Jul 1990 |
| 134.65.173.0/24 | 256 | ARIN | GB | 30th Jul 1990 |
| 134.65.186.0/23 | 512 | ARIN | GB | 30th Jul 1990 |
| 134.65.196.0/24 | 256 | ARIN | GB | 30th Jul 1990 |
| 134.65.40.0/21 | 2k | ARIN | GB | 30th Jul 1990 |
| 199.103.64.0/22 | 1k | ARIN | GB | 21st Jun 1994 |
| 199.103.86.0/24 | 256 | ARIN | GB | 25th Jun 1994 |
| 2001:504:20::/46 | 262k × /64 | ARIN | GB | 11th Mar 2011 |
| 204.231.224.0/24 | 256 | ARIN | GB | 21st Apr 1995 |
| 204.231.232.0/24 | 256 | ARIN | GB | 21st Apr 1995 |
| 204.231.253.0/24 | 256 | ARIN | GB | 4th May 1995 |
| 204.27.179.0/24 | 256 | ARIN | GB | 20th Feb 1997 |
| 204.79.134.0/24 | 256 | ARIN | GB | 14th Dec 1994 |
| 204.79.194.0/24 | 256 | ARIN | GB | 15th Dec 1994 |
| 204.79.198.0/24 | 256 | ARIN | GB | 15th Dec 1994 |
| 204.79.207.0/24 | 256 | ARIN | GB | 19th Dec 1994 |
| 204.79.211.0/24 | 256 | ARIN | GB | 19th Dec 1994 |
| 204.79.231.0/24 | 256 | ARIN | GB | 19th Dec 1994 |
| 206.123.0.0/24 | 256 | ARIN | GB | 10th Feb 2011 |
| 206.123.30.0/24 | 256 | ARIN | GB | 13th Dec 2012 |
| 206.130.2.0/23 | 512 | ARIN | GB | 17th Aug 2011 |
| 206.130.61.0/24 | 256 | ARIN | GB | 10th Feb 2011 |
| 206.197.208.0/24 | 256 | ARIN | GB | 10th Feb 2011 |
| 206.53.138.0/24 | 256 | ARIN | GB | 11th Feb 2015 |
| 2602:f73a::/36 | 268M × /64 | ARIN | GB | 10th Jan 2025 |
| 2602:f753::/36 | 268M × /64 | ARIN | GB | 30th Dec 2024 |
| 2605:8940::/32 | 4.3B × /64 | ARIN | GB | 19th Dec 2019 |
| 2620:0:2290::/48 | 65.5k × /64 | ARIN | GB | 3rd Jun 2009 |
| 2620:0:300::/48 | 65.5k × /64 | ARIN | GB | 14th May 2007 |
| 66.248.237.0/24 | 256 | ARIN | GB | 19th Dec 2019 |