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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 2605:f580::/32 | 4.3B × /64 | ARIN |  US | 19th Feb 2015 |
| 2605:f5c0::/32 | 4.3B × /64 | ARIN | US | 30th Sept 2020 |
| 2605:f640::/32 | 4.3B × /64 | ARIN | US | 1st Oct 2020 |
| 2605:f6c0::/32 | 4.3B × /64 | ARIN |  CA | 4th Oct 2020 |
| 2605:f780::/36 | 268M × /64 | ARIN | US | 20th Feb 2015 |
| 2605:f7c0::/32 | 4.3B × /64 | ARIN | US | 5th Oct 2020 |
| 2605:f800::/32 | 4.3B × /64 | ARIN | US | 11th May 2010 |
| 2605:f840::/32 | 4.3B × /64 | ARIN | US | 5th Oct 2020 |
| 2605:f8c0::/32 | 4.3B × /64 | ARIN | US | 6th Oct 2020 |
| 2605:f940::/32 | 4.3B × /64 | ARIN | US | 6th Oct 2020 |
| 2605:f9c0::/32 | 4.3B × /64 | ARIN | US | 8th Oct 2020 |
| 2605:fa00::/32 | 4.3B × /64 | ARIN | CA | 2nd Feb 2011 |
| 2605:fa40::/32 | 4.3B × /64 | ARIN | US | 8th Oct 2020 |
| 2605:fb00::/32 | 4.3B × /64 | ARIN | US | 16th Sept 2011 |
| 2605:fbc0::/32 | 4.3B × /64 | ARIN | US | 12th Oct 2020 |
| 2605:fc0::/32 | 4.3B × /64 | ARIN | US | 3rd Dec 2018 |
| 2605:fc40::/32 | 4.3B × /64 | ARIN | US | 12th Oct 2020 |
| 2605:fc80::/32 | 4.3B × /64 | ARIN | US | 23rd Feb 2015 |
| 2605:fcc0::/32 | 4.3B × /64 | ARIN | US | 12th Oct 2020 |
| 2605:fd80::/32 | 4.3B × /64 | ARIN | US | 24th Feb 2015 |
| 2605:fdc0::/32 | 4.3B × /64 | ARIN | US | 16th Oct 2020 |
| 2605:fe00::/36 | 268M × /64 | ARIN | US | 15th Jul 2013 |
| 2605:fe40::/32 | 4.3B × /64 | ARIN | US | 16th Oct 2020 |
| 2605:fec0::/32 | 4.3B × /64 | ARIN | US | 16th Oct 2020 |
| 2605:ff00::/32 | 4.3B × /64 | ARIN | US | 19th Sept 2011 |
| 2605:ff80::/32 | 4.3B × /64 | ARIN | US | 26th Feb 2015 |
| 2605:ffc0::/32 | 4.3B × /64 | ARIN | CA | 21st Oct 2020 |
| 2606:100::/32 | 4.3B × /64 | ARIN | US | 19th Sept 2011 |
| 2606:1080::/32 | 4.3B × /64 | ARIN | US | 3rd Apr 2015 |
| 2606:1100::/32 | 4.3B × /64 | ARIN | US | 27th Sept 2011 |
| 2606:1180::/32 | 4.3B × /64 | ARIN | US | 3rd Apr 2015 |
| 2606:1240::/32 | 4.3B × /64 | ARIN | US | 11th Dec 2020 |
| 2606:1300::/32 | 4.3B × /64 | ARIN | US | 27th Sept 2011 |
| 2606:1400::/32 | 4.3B × /64 | ARIN | US | 30th Aug 2010 |
| 2606:140::/32 | 4.3B × /64 | ARIN | US | 21st Oct 2020 |
| 2606:14c0::/32 | 4.3B × /64 | ARIN | US | 21st Dec 2020 |
| 2606:1580::/32 | 4.3B × /64 | ARIN | US | 13th Apr 2015 |
| 2606:15c0::/32 | 4.3B × /64 | ARIN | US | 23rd Dec 2020 |
| 2606:16c0::/32 | 4.3B × /64 | ARIN | CA | 30th Dec 2020 |
| 2606:1740::/32 | 4.3B × /64 | ARIN | US | 31st Dec 2020 |
| 2606:17c0::/32 | 4.3B × /64 | ARIN | US | 31st Dec 2020 |
| 2606:1800::/32 | 4.3B × /64 | ARIN | US | 17th May 2010 |
| 2606:180::/32 | 4.3B × /64 | ARIN | US | 2nd Mar 2015 |
| 2606:1840::/32 | 4.3B × /64 | ARIN | US | 4th Jan 2021 |
| 2606:1880::/32 | 4.3B × /64 | ARIN | US | 28th Apr 2015 |
| 2606:18c0::/32 | 4.3B × /64 | ARIN | US | 5th Jan 2021 |
| 2606:1940::/32 | 4.3B × /64 | ARIN | US | 23rd Apr 2026 |
| 2606:1a80::/32 | 4.3B × /64 | ARIN | US | 30th Apr 2015 |
| 2606:1ac0::/32 | 4.3B × /64 | ARIN | US | 6th Jan 2021 |
| 2606:1d00::/32 | 4.3B × /64 | ARIN | US | 30th Sept 2011 |