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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 64.52.10.0/24 | 256 | ARIN |  US | 6th Mar 2000 |
| 64.52.15.0/24 | 256 | ARIN | US | 6th Mar 2000 |
| 64.52.162.0/23 | 512 | ARIN | US | 14th May 2021 |
| 64.52.2.0/24 | 256 | ARIN | US | 24th Jan 2025 |
| 64.52.20.0/24 | 256 | ARIN | US | 6th Mar 2000 |
| 64.52.22.0/23 | 512 | ARIN | US | 14th May 2021 |
| 64.52.3.0/24 | 256 | ARIN | US | 3rd Jun 2021 |
| 64.52.84.0/22 | 1k | ARIN | US | 14th May 2021 |
| 64.52.88.0/21 | 2k | ARIN | US | 22nd Sept 2020 |
| 64.56.222.0/23 | 512 | ARIN | US | 7th Jul 2022 |
| 64.57.64.0/19 | 8.2k | ARIN | US | 21st Mar 2000 |
| 64.6.224.0/19 | 8.2k | ARIN | US | 7th Dec 1999 |
| 64.6.46.0/23 | 512 | ARIN | US | 10th Jan 2025 |
| 64.6.48.0/20 | 4.1k | ARIN | US | 30th Nov 1999 |
| 64.6.96.0/20 | 4.1k | ARIN | US | 10th Apr 2008 |
| 64.64.156.0/22 | 1k | ARIN | US | 3rd Oct 2024 |
| 64.64.200.0/23 | 512 | ARIN | US | 13th Apr 2010 |
| 64.64.208.0/23 | 512 | ARIN | US | 13th Apr 2010 |
| 64.64.210.0/24 | 256 | ARIN | US | 29th Nov 2012 |
| 64.64.218.0/23 | 512 | ARIN | US | 13th Apr 2010 |
| 64.65.12.0/22 | 1k | ARIN | US | 29th Nov 2022 |
| 64.65.24.0/23 | 512 | ARIN | US | 1st Apr 2025 |
| 64.65.36.0/22 | 1k | ARIN | US | 21st Apr 2025 |
| 64.65.43.0/24 | 256 | ARIN | US | 2nd Dec 2022 |
| 64.65.8.0/22 | 1k | ARIN | US | 30th May 2025 |
| 64.66.253.0/24 | 256 | ARIN | US | 31st Mar 2020 |
| 64.66.44.0/24 | 256 | ARIN | US | 15th Jul 2019 |
| 64.68.32.0/22 | 1k | ARIN | US | 29th Mar 2000 |
| 64.68.36.0/24 | 256 | ARIN | US | 26th Dec 2024 |
| 64.68.37.0/24 | 256 | ARIN | US | 29th Mar 2000 |
| 64.68.38.0/23 | 512 | ARIN | US | 29th Mar 2000 |
| 64.68.40.0/21 | 2k | ARIN | US | 29th Mar 2000 |
| 64.69.0.0/20 | 4.1k | ARIN | US | 5th Apr 2000 |
| 64.7.194.0/24 | 256 | ARIN | US | 23rd Dec 1999 |
| 64.7.196.0/24 | 256 | ARIN | US | 23rd Dec 1999 |
| 64.7.197.0/24 | 256 | ARIN | US | 12th Sept 2023 |
| 64.7.242.0/23 | 512 | ARIN | US | 3rd Oct 2025 |
| 64.7.252.0/22 | 1k | ARIN | US | 3rd Oct 2025 |
| 64.71.192.0/20 | 4.1k | ARIN | US | 25th Apr 2001 |
| 64.74.46.0/23 | 512 | ARIN | US | 5th Apr 2000 |
| 64.74.58.0/23 | 512 | ARIN | US | 5th Apr 2000 |
| 64.77.210.0/23 | 512 | ARIN | US | 3rd Sept 2004 |
| 64.78.128.0/20 | 4.1k | ARIN | US | 31st May 2006 |
| 64.83.80.0/20 | 4.1k | ARIN | US | 25th Nov 2002 |
| 64.84.128.0/17 | 32.8k | ARIN | US | 9th May 2000 |
| 64.85.16.0/21 | 2k | ARIN | US | 3rd May 2000 |
| 64.85.24.0/23 | 512 | ARIN | US | 23rd Dec 2025 |
| 64.90.120.0/22 | 1k | ARIN | US | 20th Jan 2004 |
| 64.92.224.0/19 | 8.2k | ARIN | US | 24th Jan 2006 |
| 64.93.64.0/22 | 1k | ARIN | US | 21st Dec 2022 |