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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 2606:6bc0::/32 | 4.3B × /64 | ARIN |  US | 11th Aug 2021 |
| 2606:6c40::/32 | 4.3B × /64 | ARIN | US | 16th Aug 2021 |
| 2606:6cc0::/32 | 4.3B × /64 | ARIN | US | 16th Aug 2021 |
| 2606:6d40::/32 | 4.3B × /64 | ARIN | US | 16th Aug 2021 |
| 2606:6e40::/32 | 4.3B × /64 | ARIN | US | 18th Aug 2021 |
| 2606:6f00::/32 | 4.3B × /64 | ARIN | US | 18th Nov 2011 |
| 2606:6f40::/32 | 4.3B × /64 | ARIN | US | 19th Aug 2021 |
| 2606:6fc0::/32 | 4.3B × /64 | ARIN | US | 19th Aug 2021 |
| 2606:71c0::/32 | 4.3B × /64 | ARIN | US | 24th Aug 2021 |
| 2606:7300::/32 | 4.3B × /64 | ARIN | US | 23rd Nov 2011 |
| 2606:7400::/32 | 4.3B × /64 | ARIN | US | 14th Sept 2010 |
| 2606:7500::/32 | 4.3B × /64 | ARIN | US | 23rd Nov 2011 |
| 2606:7580::/32 | 4.3B × /64 | ARIN | US | 1st Sept 2015 |
| 2606:7600::/32 | 4.3B × /64 | ARIN | US | 8th Feb 2011 |
| 2606:7640::/32 | 4.3B × /64 | ARIN | US | 2nd Sept 2021 |
| 2606:7680::/32 | 4.3B × /64 | ARIN |  CA | 2nd Sept 2015 |
| 2606:77c0::/32 | 4.3B × /64 | ARIN | US | 10th Sept 2021 |
| 2606:780::/32 | 4.3B × /64 | ARIN | US | 9th Mar 2015 |
| 2606:7840::/32 | 4.3B × /64 | ARIN | US | 10th Sept 2021 |
| 2606:7880::/32 | 4.3B × /64 | ARIN | CA | 3rd Sept 2015 |
| 2606:78c0::/32 | 4.3B × /64 | ARIN | US | 10th Sept 2021 |
| 2606:7ac0::/32 | 4.3B × /64 | ARIN | US | 14th Sept 2021 |
| 2606:7b00::/32 | 4.3B × /64 | ARIN | US | 28th Nov 2011 |
| 2606:7b80::/32 | 4.3B × /64 | ARIN | US | 3rd Sept 2015 |
| 2606:7cc0::/32 | 4.3B × /64 | ARIN | CA | 17th Sept 2021 |
| 2606:7dc0::/32 | 4.3B × /64 | ARIN | US | 24th Sept 2021 |
| 2606:7f40::/32 | 4.3B × /64 | ARIN | US | 30th Sept 2021 |
| 2606:7f80::/32 | 4.3B × /64 | ARIN | US | 10th Sept 2015 |
| 2606:7fc0::/32 | 4.3B × /64 | ARIN | US | 1st Oct 2021 |
| 2606:8040::/32 | 4.3B × /64 | ARIN | US | 4th Oct 2021 |
| 2606:8080::/32 | 4.3B × /64 | ARIN | US | 14th Sept 2015 |
| 2606:80c0::/32 | 4.3B × /64 | ARIN | US | 4th Oct 2021 |
| 2606:8100::/32 | 4.3B × /64 | ARIN | US | 1st Dec 2011 |
| 2606:8280::/36 | 268M × /64 | ARIN | US | 15th Sept 2015 |
| 2606:8380::/32 | 4.3B × /64 | ARIN | US | 16th Sept 2015 |
| 2606:8480::/32 | 4.3B × /64 | ARIN | US | 17th Sept 2015 |
| 2606:8500::/32 | 4.3B × /64 | ARIN | US | 2nd Dec 2011 |
| 2606:8540::/32 | 4.3B × /64 | ARIN | US | 14th Oct 2021 |
| 2606:8580::/32 | 4.3B × /64 | ARIN | US | 22nd Sept 2015 |
| 2606:85c0::/32 | 4.3B × /64 | ARIN | US | 15th Oct 2021 |
| 2606:86c0::/32 | 4.3B × /64 | ARIN | US | 26th Oct 2021 |
| 2606:8740::/32 | 4.3B × /64 | ARIN | US | 26th Oct 2021 |
| 2606:87c0::/32 | 4.3B × /64 | ARIN | US | 26th Oct 2021 |
| 2606:8880::/32 | 4.3B × /64 | ARIN | US | 23rd Sept 2015 |
| 2606:88c0::/32 | 4.3B × /64 | ARIN | US | 29th Oct 2021 |
| 2606:8a80::/32 | 4.3B × /64 | ARIN | US | 25th Sept 2015 |
| 2606:8b00::/32 | 4.3B × /64 | ARIN | US | 9th Dec 2011 |
| 2606:8bc0::/32 | 4.3B × /64 | ARIN | US | 8th Nov 2021 |
| 2606:8c0::/32 | 4.3B × /64 | ARIN | US | 9th Nov 2020 |
| 2606:8f40::/32 | 4.3B × /64 | ARIN | US | 17th Nov 2021 |