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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
27,001 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2606:d800::/32 | 4.3B × /64 | ARIN |  US | 1st Jun 2010 |
| 2606:d80::/32 | 4.3B × /64 | ARIN | US | 26th Mar 2015 |
| 2606:d8c0::/32 | 4.3B × /64 | ARIN | US | 6th Jun 2022 |
| 2606:d940::/32 | 4.3B × /64 | ARIN | US | 6th Jun 2022 |
| 2606:da00::/32 | 4.3B × /64 | ARIN | US | 16th Feb 2011 |
| 2606:da80::/36 | 268M × /64 | ARIN | US | 22nd Dec 2015 |
| 2606:dc40::/32 | 4.3B × /64 | ARIN | US | 13th Jun 2022 |
| 2606:dc80::/32 | 4.3B × /64 | ARIN | US | 22nd Dec 2015 |
| 2606:dd00::/36 | 268M × /64 | ARIN | US | 26th Jan 2012 |
| 2606:dd40::/32 | 4.3B × /64 | ARIN | US | 15th Jun 2022 |
| 2606:de80::/32 | 4.3B × /64 | ARIN | US | 28th Dec 2015 |
| 2606:df00::/32 | 4.3B × /64 | ARIN | US | 26th Jan 2012 |
| 2606:e0c0::/32 | 4.3B × /64 | ARIN | US | 7th Jul 2022 |
| 2606:e100::/32 | 4.3B × /64 | ARIN | US | 26th Jan 2012 |
| 2606:e140::/32 | 4.3B × /64 | ARIN | US | 7th Jul 2022 |
| 2606:e240::/32 | 4.3B × /64 | ARIN | US | 7th Jul 2022 |
| 2606:e340::/32 | 4.3B × /64 | ARIN | US | 12th Jul 2022 |
| 2606:e3c0::/32 | 4.3B × /64 | ARIN | US | 14th Jul 2022 |
| 2606:e440::/32 | 4.3B × /64 | ARIN | US | 25th Jul 2022 |
| 2606:e5c0::/32 | 4.3B × /64 | ARIN | US | 27th Jul 2022 |
| 2606:e640::/32 | 4.3B × /64 | ARIN | US | 28th Jul 2022 |
| 2606:e680::/32 | 4.3B × /64 | ARIN | US | 28th May 2026 |
| 2606:e700::/32 | 4.3B × /64 | ARIN | US | 1st Feb 2012 |
| 2606:e80::/32 | 4.3B × /64 | ARIN | US | 31st Mar 2015 |
| 2606:e840::/32 | 4.3B × /64 | ARIN | US | 3rd Aug 2022 |
| 2606:e9c0::/32 | 4.3B × /64 | ARIN | US | 5th Aug 2022 |
| 2606:ea80::/32 | 4.3B × /64 | ARIN | US | 13th Jan 2016 |
| 2606:eb80::/32 | 4.3B × /64 | ARIN | US | 13th Jan 2016 |
| 2606:ebc0::/32 | 4.3B × /64 | ARIN | US | 12th Aug 2022 |
| 2606:ed80::/32 | 4.3B × /64 | ARIN | US | 20th Jan 2016 |
| 2606:ee80::/32 | 4.3B × /64 | ARIN | US | 21st Jan 2016 |
| 2606:ef00::/32 | 4.3B × /64 | ARIN | US | 6th Feb 2012 |
| 2606:f00::/32 | 4.3B × /64 | ARIN | US | 27th Sept 2011 |
| 2606:f0c0::/32 | 4.3B × /64 | ARIN | US | 22nd Aug 2022 |
| 2606:f380::/32 | 4.3B × /64 | ARIN | US | 3rd Feb 2016 |
| 2606:f440::/32 | 4.3B × /64 | ARIN | US | 1st Sept 2022 |
| 2606:f540::/32 | 4.3B × /64 | ARIN | US | 5th Sept 2022 |
| 2606:f600::/32 | 4.3B × /64 | ARIN | US | 17th Feb 2011 |
| 2606:f680::/32 | 4.3B × /64 | ARIN | US | 9th Feb 2016 |
| 2606:f740::/32 | 4.3B × /64 | ARIN | US | 8th Sept 2022 |
| 2606:f780::/32 | 4.3B × /64 | ARIN | US | 9th Feb 2016 |
| 2606:f7c0::/32 | 4.3B × /64 | ARIN | US | 13th Sept 2022 |
| 2606:f800::/32 | 4.3B × /64 | ARIN | US | 11th Jul 2011 |
| 2606:f980::/32 | 4.3B × /64 | ARIN | US | 10th Feb 2016 |
| 2606:fb00::/32 | 4.3B × /64 | ARIN | US | 1st Jun 2026 |
| 2606:fb80::/32 | 4.3B × /64 | ARIN | US | 11th Feb 2016 |
| 2606:fc0::/32 | 4.3B × /64 | ARIN | US | 8th Dec 2020 |
| 2606:fc80::/32 | 4.3B × /64 | ARIN | US | 11th Feb 2016 |
| 2606:fcc0::/32 | 4.3B × /64 | ARIN | US | 27th Sept 2022 |
| 2606:fdc0::/32 | 4.3B × /64 | ARIN | US | 6th Oct 2022 |