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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 States
26,300 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 206.109.240.0/20 | 4.1k | ARIN |  US | 26th Jun 2026 |
| 206.109.60.0/23 | 512 | ARIN | US | 17th Feb 2026 |
| 206.109.83.0/24 | 256 | ARIN | US | 16th Jan 2026 |
| 206.109.84.0/22 | 1k | ARIN | US | 4th Feb 2026 |
| 206.109.88.0/21 | 2k | ARIN | US | 8th Jun 2026 |
| 206.120.0.0/16 | 65.5k | ARIN | US | 1st Apr 2022 |
| 206.122.0.0/16 | 65.5k | ARIN | US | 7th Sept 1995 |
| 206.123.24.0/24 | 256 | ARIN | US | 20th Sept 2012 |
| 206.123.7.0/24 | 256 | ARIN | US | 28th Dec 2011 |
| 206.124.32.0/21 | 2k | ARIN | US | 14th Sept 1995 |
| 206.124.40.0/22 | 1k | ARIN | US | 25th Feb 2020 |
| 206.124.96.0/21 | 2k | ARIN | US | 20th Sept 1995 |
| 206.125.0.0/19 | 8.2k | ARIN | US | 27th Sept 1995 |
| 206.125.192.0/21 | 2k | ARIN | US | 3rd Oct 1995 |
| 206.125.224.0/19 | 8.2k | ARIN | US | 3rd Oct 1995 |
| 206.125.96.0/19 | 8.2k | ARIN | US | 28th Sept 1995 |
| 206.126.101.0/24 | 256 | ARIN | US | 19th Feb 1996 |
| 206.126.107.0/24 | 256 | ARIN | US | 25th Feb 1996 |
| 206.126.108.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 206.126.113.0/24 | 256 | ARIN | US | 25th Feb 1996 |
| 206.126.114.0/23 | 512 | ARIN | US | 2nd Jul 2009 |
| 206.126.116.0/24 | 256 | ARIN | US | 8th Apr 2013 |
| 206.126.117.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 206.126.118.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 206.126.119.0/24 | 256 | ARIN | US | 25th Feb 1996 |
| 206.126.192.0/21 | 2k | ARIN | US | 10th Oct 1995 |
| 206.126.232.0/23 | 512 | ARIN | US | 4th Aug 2015 |
| 206.126.235.0/24 | 256 | ARIN | US | 3rd Dec 2013 |
| 206.126.64.0/21 | 2k | ARIN | US | 9th Oct 1995 |
| 206.127.128.0/21 | 2k | ARIN | US | 17th Oct 1995 |
| 206.127.160.0/21 | 2k | ARIN | US | 17th Oct 1995 |
| 206.128.112.0/21 | 2k | ARIN | US | 10th May 1995 |
| 206.128.192.0/20 | 4.1k | ARIN | US | 10th May 1995 |
| 206.128.208.0/21 | 2k | ARIN | US | 10th May 1995 |
| 206.128.220.0/22 | 1k | ARIN | US | 10th May 1995 |
| 206.128.224.0/19 | 8.2k | ARIN | US | 10th May 1995 |
| 206.128.32.0/19 | 8.2k | ARIN | US | 10th May 1995 |
| 206.13.128.0/17 | 32.8k | ARIN | US | 15th May 1995 |
| 206.130.10.0/24 | 256 | ARIN | US | 29th Jan 2014 |
| 206.130.243.0/24 | 256 | ARIN | US | 21st Oct 2015 |
| 206.130.5.0/24 | 256 | ARIN | US | 6th Aug 2018 |
| 206.130.6.0/24 | 256 | ARIN | US | 7th Oct 2015 |
| 206.130.72.0/24 | 256 | ARIN | US | 1st Jul 2026 |
| 206.131.160.0/19 | 8.2k | ARIN | US | 2nd Mar 1999 |
| 206.143.128.0/17 | 32.8k | ARIN | US | 9th Oct 1995 |
| 206.15.129.0/24 | 256 | ARIN | US | 25th May 1995 |
| 206.151.48.0/20 | 4.1k | ARIN | US | 6th Oct 1995 |
| 206.153.0.0/18 | 16.4k | ARIN | US | 6th Oct 1995 |
| 206.153.128.0/17 | 32.8k | ARIN | US | 6th Oct 1995 |
| 206.153.64.0/19 | 8.2k | ARIN | US | 6th Oct 1995 |