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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 the most unannounced blocks, largest first.
Unannounced blocks in United States
26,965 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 96.31.128.0/19 | 8.2k | ARIN |  US | 29th Dec 2008 |
| 96.45.60.0/22 | 1k | ARIN | US | 6th Oct 2025 |
| 96.47.168.0/22 | 1k | ARIN | US | 3rd Apr 2025 |
| 97.107.232.0/22 | 1k | ARIN | US | 21st Sept 2016 |
| 97.64.100.0/22 | 1k | ARIN | US | 8th Apr 2009 |
| 97.64.88.0/22 | 1k | ARIN | US | 3rd Jul 2017 |
| 97.64.92.0/24 | 256 | ARIN | US | 29th Nov 2017 |
| 97.64.94.0/23 | 512 | ARIN | US | 26th Oct 2017 |
| 98.132.0.0/14 | 262k | ARIN | US | 11th May 2007 |
| 98.142.181.0/24 | 256 | ARIN | US | 4th Nov 2019 |
| 98.142.224.0/20 | 4.1k | ARIN | US | 27th Apr 2009 |
| 98.158.20.0/22 | 1k | ARIN | US | 26th Dec 2024 |
| 98.158.24.0/22 | 1k | ARIN | US | 13th Feb 2025 |
| 99.181.64.0/18 | 16.4k | ARIN | US | 10th Jan 2018 |
| 99.200.0.0/13 | 524k | ARIN | US | 12th Dec 2024 |