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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 2606:1d80::/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 |
| 2606:2700::/32 | 4.3B × /64 | ARIN | CA | 10th Oct 2011 |
| 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 |
| 2606:2980::/32 | 4.3B × /64 | ARIN | US | 29th May 2015 |
| 2606:2a40::/32 | 4.3B × /64 | ARIN | US | 23rd Feb 2021 |
| 2606:2b40::/32 | 4.3B × /64 | ARIN | US | 4th Mar 2021 |
| 2606:2bc0::/32 | 4.3B × /64 | ARIN | CA | 4th Mar 2021 |
| 2606:2c00::/32 | 4.3B × /64 | ARIN | US | 2nd Sept 2010 |
| 2606:2d40::/32 | 4.3B × /64 | ARIN | US | 9th Mar 2021 |
| 2606:2d80::/32 | 4.3B × /64 | ARIN | US | 5th May 2026 |
| 2606:2dc0::/32 | 4.3B × /64 | ARIN | US | 9th Mar 2021 |
| 2606:2e00::/32 | 4.3B × /64 | ARIN | US | 4th Feb 2011 |
| 2606:2e40::/32 | 4.3B × /64 | ARIN | US | 11th Mar 2021 |
| 2606:2ec0::/32 | 4.3B × /64 | ARIN | US | 11th Mar 2021 |
| 2606:2f00::/32 | 4.3B × /64 | ARIN | US | 13th Oct 2011 |
| 2606:300::/32 | 4.3B × /64 | ARIN | US | 20th Sept 2011 |
| 2606:3040::/32 | 4.3B × /64 | ARIN | US | 15th Mar 2021 |
| 2606:30c0::/32 | 4.3B × /64 | ARIN | US | 15th Mar 2021 |
| 2606:3100::/32 | 4.3B × /64 | ARIN | CA | 13th Oct 2011 |
| 2606:3140::/32 | 4.3B × /64 | ARIN | CA | 16th Mar 2021 |
| 2606:31c0::/32 | 4.3B × /64 | ARIN | US | 17th Mar 2021 |
| 2606:3200::/32 | 4.3B × /64 | ARIN | US | 4th Feb 2011 |
| 2606:32c0::/32 | 4.3B × /64 | ARIN | US | 18th Mar 2021 |
| 2606:3480::/32 | 4.3B × /64 | ARIN | US | 22nd Jun 2015 |
| 2606:3500::/32 | 4.3B × /64 | ARIN | US | 14th Oct 2011 |
| 2606:3540::/32 | 4.3B × /64 | ARIN | US | 23rd Mar 2021 |
| 2606:3880::/32 | 4.3B × /64 | ARIN | US | 25th Jun 2015 |
| 2606:3940::/32 | 4.3B × /64 | ARIN | US | 30th Mar 2021 |