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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,459 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2606:59c0::/32 | 4.3B × /64 | ARIN |  US | 15th Jun 2021 |
| 2606:5a00::/32 | 4.3B × /64 | ARIN |  VI | 2nd Jun 2014 |
| 2606:5a80::/32 | 4.3B × /64 | ARIN | US | 22nd Jul 2015 |
| 2606:5ac0::/32 | 4.3B × /64 | ARIN |  PR | 21st Jun 2021 |
| 2606:5c00::/32 | 4.3B × /64 | ARIN | US | 10th Sept 2010 |
| 2606:5c0::/32 | 4.3B × /64 | ARIN | US | 29th Oct 2020 |
| 2606:5c40::/32 | 4.3B × /64 | ARIN | US | 25th Jun 2021 |
| 2606:5d40::/32 | 4.3B × /64 | ARIN | US | 29th Jun 2021 |
| 2606:5ec0::/32 | 4.3B × /64 | ARIN | US | 2nd Jul 2021 |
| 2606:5f40::/32 | 4.3B × /64 | ARIN | US | 8th Jul 2021 |
| 2606:5fc0::/32 | 4.3B × /64 | ARIN |  CA | 8th Jul 2021 |
| 2606:60c0::/32 | 4.3B × /64 | ARIN | CA | 9th Jul 2021 |
| 2606:6180::/32 | 4.3B × /64 | ARIN | CA | 11th May 2026 |
| 2606:61c0::/32 | 4.3B × /64 | ARIN | US | 12th Jul 2021 |
| 2606:62c0::/32 | 4.3B × /64 | ARIN | US | 13th Jul 2021 |
| 2606:6340::/32 | 4.3B × /64 | ARIN | US | 14th May 2026 |
| 2606:6400::/32 | 4.3B × /64 | ARIN | US | 13th Sept 2010 |
| 2606:6480::/32 | 4.3B × /64 | ARIN | CA | 17th Aug 2015 |
| 2606:64c0::/32 | 4.3B × /64 | ARIN | CA | 21st Jul 2021 |
| 2606:6540::/32 | 4.3B × /64 | ARIN | US | 21st Jul 2021 |
| 2606:6600::/32 | 4.3B × /64 | ARIN | US | 8th Feb 2011 |
| 2606:6640::/32 | 4.3B × /64 | ARIN | US | 18th May 2026 |
| 2606:66c0::/32 | 4.3B × /64 | ARIN | US | 28th Jul 2021 |
| 2606:6700::/32 | 4.3B × /64 | ARIN | US | 14th Nov 2011 |
| 2606:6780::/32 | 4.3B × /64 | ARIN | CA | 18th Aug 2015 |
| 2606:67c0::/32 | 4.3B × /64 | ARIN | US | 5th Aug 2021 |
| 2606:6840::/32 | 4.3B × /64 | ARIN | US | 6th Aug 2021 |
| 2606:6900::/32 | 4.3B × /64 | ARIN | US | 15th Nov 2011 |
| 2606:6940::/32 | 4.3B × /64 | ARIN | US | 9th Aug 2021 |
| 2606:6980::/32 | 4.3B × /64 | ARIN | US | 19th Aug 2015 |
| 2606:6b00::/32 | 4.3B × /64 | ARIN | US | 15th Nov 2011 |
| 2606:6b80::/32 | 4.3B × /64 | ARIN | US | 24th Aug 2015 |
| 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 |
| 2606:7680::/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 |