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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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:b680::/32 | 4.3B × /64 | ARIN |  US | 16th Nov 2015 |
| 2606:b6c0::/32 | 4.3B × /64 | ARIN |  CA | 22nd Feb 2022 |
| 2606:b780::/32 | 4.3B × /64 | ARIN | US | 16th Nov 2015 |
| 2606:b800::/32 | 4.3B × /64 | ARIN | CA | 26th May 2010 |
| 2606:b840::/32 | 4.3B × /64 | ARIN | US | 23rd Feb 2022 |
| 2606:b880::/32 | 4.3B × /64 | ARIN | US | 17th Nov 2015 |
| 2606:b8c0::/32 | 4.3B × /64 | ARIN | US | 23rd Feb 2022 |
| 2606:b9c0::/32 | 4.3B × /64 | ARIN | US | 2nd Mar 2022 |
| 2606:ba40::/32 | 4.3B × /64 | ARIN | US | 2nd Mar 2022 |
| 2606:ba80::/32 | 4.3B × /64 | ARIN | US | 19th Nov 2015 |
| 2606:bb00::/32 | 4.3B × /64 | ARIN | US | 4th Jan 2012 |
| 2606:bb80::/32 | 4.3B × /64 | ARIN | US | 20th Nov 2015 |
| 2606:bc00::/32 | 4.3B × /64 | ARIN | US | 20th Sept 2010 |
| 2606:bc40::/32 | 4.3B × /64 | ARIN | US | 4th Mar 2022 |
| 2606:bc80::/32 | 4.3B × /64 | ARIN | US | 20th Nov 2015 |
| 2606:bcc0::/32 | 4.3B × /64 | ARIN | US | 4th Mar 2022 |
| 2606:bd40::/32 | 4.3B × /64 | ARIN | US | 4th Mar 2022 |
| 2606:bdc0::/32 | 4.3B × /64 | ARIN | US | 7th Mar 2022 |
| 2606:be40::/32 | 4.3B × /64 | ARIN | US | 8th Mar 2022 |
| 2606:bf80::/32 | 4.3B × /64 | ARIN | US | 1st Dec 2015 |
| 2606:bfc0::/32 | 4.3B × /64 | ARIN | US | 8th Mar 2022 |
| 2606:c100::/32 | 4.3B × /64 | ARIN | US | 9th Jan 2012 |
| 2606:c180::/32 | 4.3B × /64 | ARIN | US | 2nd Dec 2015 |
| 2606:c1c0::/32 | 4.3B × /64 | ARIN | US | 16th Mar 2022 |
| 2606:c1f0::/32 | 4.3B × /64 | ARIN | US | 10th Jul 2026 |
| 2606:c300::/32 | 4.3B × /64 | ARIN | US | 10th Jan 2012 |
| 2606:c340::/32 | 4.3B × /64 | ARIN | CA | 28th Mar 2022 |
| 2606:c3c0::/32 | 4.3B × /64 | ARIN | US | 30th Mar 2022 |
| 2606:c400::/32 | 4.3B × /64 | ARIN | US | 21st May 2026 |
| 2606:c500::/32 | 4.3B × /64 | ARIN |  JM | 8th Jan 2024 |
| 2606:c540::/32 | 4.3B × /64 | ARIN | US | 4th Apr 2022 |
| 2606:c580::/32 | 4.3B × /64 | ARIN | US | 4th Dec 2015 |
| 2606:c5c0::/32 | 4.3B × /64 | ARIN | US | 4th Apr 2022 |
| 2606:c600::/32 | 4.3B × /64 | ARIN | US | 27th May 2026 |
| 2606:c780::/32 | 4.3B × /64 | ARIN | US | 7th Dec 2015 |
| 2606:c80::/32 | 4.3B × /64 | ARIN | US | 16th Apr 2026 |
| 2606:c840::/32 | 4.3B × /64 | ARIN | US | 13th Apr 2022 |
| 2606:c880::/32 | 4.3B × /64 | ARIN | CA | 8th Dec 2015 |
| 2606:c940::/28 | 68.7B × /64 | ARIN | US | 13th Apr 2022 |
| 2606:c980::/32 | 4.3B × /64 | ARIN | US | 8th Dec 2015 |
| 2606:ca80::/32 | 4.3B × /64 | ARIN | US | 8th Dec 2015 |
| 2606:cb00::/32 | 4.3B × /64 | ARIN | US | 13th Jan 2012 |
| 2606:cc40::/32 | 4.3B × /64 | ARIN | US | 20th Apr 2022 |
| 2606:cc80::/32 | 4.3B × /64 | ARIN | US | 10th Dec 2015 |
| 2606:cd00::/32 | 4.3B × /64 | ARIN | US | 17th Jan 2012 |
| 2606:cde0::/32 | 4.3B × /64 | ARIN | US | 21st Jul 2026 |
| 2606:cf40::/32 | 4.3B × /64 | ARIN | US | 4th May 2022 |
| 2606:d000::/32 | 4.3B × /64 | ARIN | US | 2nd Apr 2010 |
| 2606:d00::/32 | 4.3B × /64 | ARIN | US | 26th Sept 2011 |
| 2606:d080::/32 | 4.3B × /64 | ARIN | US | 16th Dec 2015 |