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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,279 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2606:d0c0::/36 | 268M × /64 | ARIN |  US | 5th May 2022 |
| 2606:d100::/32 | 4.3B × /64 | ARIN | US | 19th Jan 2012 |
| 2606:d140::/32 | 4.3B × /64 | ARIN | US | 5th May 2022 |
| 2606:d180::/32 | 4.3B × /64 | ARIN |  CA | 17th Dec 2015 |
| 2606:d2c0::/32 | 4.3B × /64 | ARIN | US | 11th May 2022 |
| 2606:d300::/36 | 268M × /64 | ARIN | US | 19th Jan 2012 |
| 2606:d340::/32 | 4.3B × /64 | ARIN | US | 16th May 2022 |
| 2606:d3c0::/32 | 4.3B × /64 | ARIN | US | 20th May 2022 |
| 2606:d400::/32 | 4.3B × /64 | ARIN | US | 22nd Sept 2010 |
| 2606:d480::/32 | 4.3B × /64 | ARIN | US | 18th Dec 2015 |
| 2606:d4c0::/32 | 4.3B × /64 | ARIN | CA | 24th May 2022 |
| 2606:d540::/32 | 4.3B × /64 | ARIN | US | 24th May 2022 |
| 2606:d580::/32 | 4.3B × /64 | ARIN | US | 18th Dec 2015 |
| 2606:d600::/32 | 4.3B × /64 | ARIN | US | 16th Feb 2011 |
| 2606:d640::/32 | 4.3B × /64 | ARIN | US | 26th May 2022 |
| 2606:d740::/32 | 4.3B × /64 | ARIN | US | 31st May 2022 |
| 2606:d780::/32 | 4.3B × /64 | ARIN | US | 22nd Dec 2015 |
| 2606:d7c0::/32 | 4.3B × /64 | ARIN | CA | 31st May 2022 |
| 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:dd80::/32 | 4.3B × /64 | ARIN | CA | 23rd Dec 2015 |
| 2606:de00::/32 | 4.3B × /64 | ARIN | CA | 16th Feb 2011 |
| 2606:de80::/32 | 4.3B × /64 | ARIN | US | 28th Dec 2015 |
| 2606:dec0::/32 | 4.3B × /64 | ARIN | CA | 27th Jun 2022 |
| 2606:df00::/32 | 4.3B × /64 | ARIN | US | 26th Jan 2012 |
| 2606:df40::/32 | 4.3B × /64 | ARIN | CA | 28th Jun 2022 |
| 2606:dfc0::/32 | 4.3B × /64 | ARIN | CA | 30th Jun 2022 |
| 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:e1c0::/32 | 4.3B × /64 | ARIN | CA | 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:e380::/32 | 4.3B × /64 | ARIN | CA | 5th Jan 2016 |
| 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 |