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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
26,273 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 64.190.204.0/23 | 512 | ARIN |  US | 14th May 2021 |
| 64.190.207.0/24 | 256 | ARIN | US | 31st May 2002 |
| 64.190.212.0/24 | 256 | ARIN | US | 3rd Oct 2024 |
| 64.190.214.0/24 | 256 | ARIN | US | 6th Dec 2024 |
| 64.190.215.0/24 | 256 | ARIN | US | 18th Oct 2024 |
| 64.190.224.0/24 | 256 | ARIN | US | 19th Nov 2021 |
| 64.190.225.0/24 | 256 | ARIN | US | 16th Dec 2020 |
| 64.190.241.0/24 | 256 | ARIN | US | 31st May 2002 |
| 64.190.3.0/24 | 256 | ARIN | US | 31st May 2002 |
| 64.190.5.0/24 | 256 | ARIN | US | 31st May 2002 |
| 64.190.6.0/23 | 512 | ARIN | US | 31st May 2002 |
| 64.190.8.0/23 | 512 | ARIN | US | 31st May 2002 |
| 64.190.80.0/24 | 256 | ARIN | US | 31st Dec 2020 |
| 64.190.82.0/24 | 256 | ARIN | US | 31st May 2002 |
| 64.190.90.0/23 | 512 | ARIN | US | 14th May 2021 |
| 64.191.16.0/20 | 4.1k | ARIN | US | 10th Sept 2015 |
| 64.191.2.0/24 | 256 | ARIN | US | 16th Jan 2015 |
| 64.191.3.0/24 | 256 | ARIN | US | 22nd Feb 2017 |
| 64.201.144.0/20 | 4.1k | ARIN | US | 10th Jan 2007 |
| 64.202.48.0/20 | 4.1k | ARIN | US | 10th Jan 2007 |
| 64.207.207.0/24 | 256 | ARIN | US | 18th Jun 2018 |
| 64.207.64.0/19 | 8.2k | ARIN | US | 13th Sept 2002 |
| 64.22.108.0/23 | 512 | ARIN | US | 26th Nov 2018 |
| 64.22.112.0/24 | 256 | ARIN | US | 13th Jul 2006 |
| 64.22.124.0/23 | 512 | ARIN | US | 26th Nov 2018 |
| 64.22.126.0/24 | 256 | ARIN | US | 13th Jul 2006 |
| 64.22.127.0/24 | 256 | ARIN | US | 26th Nov 2018 |
| 64.22.71.0/24 | 256 | ARIN | US | 26th Nov 2018 |
| 64.22.74.0/24 | 256 | ARIN | US | 31st Aug 2023 |
| 64.22.80.0/24 | 256 | ARIN | US | 17th Apr 2018 |
| 64.22.84.0/24 | 256 | ARIN | US | 26th Nov 2018 |
| 64.22.88.0/23 | 512 | ARIN | US | 13th Jul 2006 |
| 64.22.94.0/24 | 256 | ARIN | US | 29th Feb 2024 |
| 64.224.160.0/19 | 8.2k | ARIN | US | 7th Sept 2021 |
| 64.224.32.0/19 | 8.2k | ARIN | US | 29th Oct 2021 |
| 64.225.246.0/24 | 256 | ARIN | US | 24th Jan 2022 |
| 64.227.216.0/21 | 2k | ARIN | US | 20th Oct 2023 |
| 64.227.228.0/22 | 1k | ARIN | US | 20th Oct 2023 |
| 64.227.232.0/21 | 2k | ARIN | US | 20th Oct 2023 |
| 64.234.117.0/24 | 256 | ARIN | US | 29th Aug 2019 |
| 64.234.119.0/24 | 256 | ARIN | US | 28th Aug 2019 |
| 64.234.224.0/22 | 1k | ARIN | US | 1st Oct 2021 |
| 64.235.128.0/20 | 4.1k | ARIN | US | 13th Sept 2002 |
| 64.235.160.0/19 | 8.2k | ARIN | US | 16th Sept 2002 |
| 64.238.32.0/23 | 512 | ARIN | US | 26th Sept 2001 |
| 64.238.35.0/24 | 256 | ARIN | US | 26th Sept 2001 |
| 64.238.39.0/24 | 256 | ARIN | US | 26th Sept 2001 |
| 64.238.64.0/19 | 8.2k | ARIN | US | 27th Sept 2001 |
| 64.239.0.0/22 | 1k | ARIN | US | 15th Mar 2023 |
| 64.239.16.0/23 | 512 | ARIN | US | 24th Jun 2025 |