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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 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 |
| 2606:1d80::/32 | 4.3B × /64 | ARIN | US | 23rd Apr 2026 |
| 2606:1dc0::/32 | 4.3B × /64 | ARIN | US | 13th Jan 2021 |
| 2606:1e40::/32 | 4.3B × /64 | ARIN | US | 15th Jan 2021 |
| 2606:1ec0::/32 | 4.3B × /64 | ARIN |  BM | 15th Jan 2021 |
| 2606:1f00::/32 | 4.3B × /64 | ARIN | US | 28th May 2013 |
| 2606:1f40::/32 | 4.3B × /64 | ARIN | US | 15th Jan 2021 |
| 2606:2000::/32 | 4.3B × /64 | ARIN | US | 5th Mar 2010 |
| 2606:2080::/32 | 4.3B × /64 | ARIN | US | 11th May 2015 |
| 2606:20c0::/32 | 4.3B × /64 | ARIN | US | 20th Jan 2021 |
| 2606:2100::/32 | 4.3B × /64 | ARIN | US | 3rd Oct 2011 |
| 2606:21c0::/32 | 4.3B × /64 | ARIN | CA | 21st Jan 2021 |
| 2606:2240::/32 | 4.3B × /64 | ARIN | US | 25th Jan 2021 |
| 2606:2280::/32 | 4.3B × /64 | ARIN | US | 14th May 2015 |
| 2606:2300::/32 | 4.3B × /64 | ARIN | US | 6th Oct 2011 |
| 2606:2340::/32 | 4.3B × /64 | ARIN | CA | 1st Feb 2021 |
| 2606:2540::/32 | 4.3B × /64 | ARIN | US | 5th Feb 2021 |
| 2606:2640::/32 | 4.3B × /64 | ARIN | US | 9th Feb 2021 |
| 2606:2780::/32 | 4.3B × /64 | ARIN | US | 26th May 2015 |
| 2606:27c0::/32 | 4.3B × /64 | ARIN | US | 17th Feb 2021 |
| 2606:2840::/32 | 4.3B × /64 | ARIN | US | 18th Feb 2021 |
| 2606:2880::/32 | 4.3B × /64 | ARIN | US | 28th May 2015 |
| 2606:28c0::/32 | 4.3B × /64 | ARIN | US | 19th Feb 2021 |
| 2606:2900::/32 | 4.3B × /64 | ARIN | US | 10th Oct 2011 |
| 2606:2940::/32 | 4.3B × /64 | ARIN | US | 19th Feb 2021 |
| 2606:2a40::/32 | 4.3B × /64 | ARIN | US | 23rd Feb 2021 |
| 2606:2b40::/32 | 4.3B × /64 | ARIN | US | 4th Mar 2021 |