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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 2606:9000::/32 | 4.3B × /64 | ARIN |  US | 5th Oct 2012 |
| 2606:9040::/32 | 4.3B × /64 | ARIN | US | 18th Nov 2021 |
| 2606:90c0::/32 | 4.3B × /64 | ARIN | US | 18th Nov 2021 |
| 2606:9180::/32 | 4.3B × /64 | ARIN | US | 1st Oct 2015 |
| 2606:91c0::/32 | 4.3B × /64 | ARIN | US | 19th Nov 2021 |
| 2606:9280::/32 | 4.3B × /64 | ARIN | US | 2nd Oct 2015 |
| 2606:940::/32 | 4.3B × /64 | ARIN | US | 9th Nov 2020 |
| 2606:9480::/32 | 4.3B × /64 | ARIN | US | 5th Oct 2015 |
| 2606:9900::/32 | 4.3B × /64 | ARIN | US | 15th Dec 2011 |
| 2606:9a80::/32 | 4.3B × /64 | ARIN | US | 8th Oct 2015 |
| 2606:9b80::/32 | 4.3B × /64 | ARIN | US | 8th Oct 2015 |
| 2606:9bc0::/32 | 4.3B × /64 | ARIN | US | 20th Dec 2021 |
| 2606:9c0::/32 | 4.3B × /64 | ARIN | US | 12th Nov 2020 |
| 2606:9d40::/32 | 4.3B × /64 | ARIN | US | 21st Dec 2021 |
| 2606:9e00::/32 | 4.3B × /64 | ARIN |  BM | 11th Feb 2011 |
| 2606:9e80::/32 | 4.3B × /64 | ARIN | US | 9th Oct 2015 |
| 2606:9ec0::/32 | 4.3B × /64 | ARIN | US | 27th Dec 2021 |
| 2606:9f80::/32 | 4.3B × /64 | ARIN | US | 12th Oct 2015 |
| 2606:a00::/32 | 4.3B × /64 | ARIN | US | 3rd Feb 2011 |
| 2606:a080::/32 | 4.3B × /64 | ARIN | US | 12th Oct 2015 |
| 2606:a0c0::/32 | 4.3B × /64 | ARIN | US | 3rd Jan 2022 |
| 2606:a180::/32 | 4.3B × /64 | ARIN | US | 13th Oct 2015 |
| 2606:a340::/32 | 4.3B × /64 | ARIN | US | 11th Jan 2022 |
| 2606:a380::/32 | 4.3B × /64 | ARIN | US | 8th Feb 2022 |
| 2606:a400::/32 | 4.3B × /64 | ARIN | US | 17th Sept 2010 |
| 2606:a4c0::/32 | 4.3B × /64 | ARIN | US | 14th Jan 2022 |
| 2606:a500::/32 | 4.3B × /64 | ARIN | US | 22nd Dec 2011 |
| 2606:a540::/32 | 4.3B × /64 | ARIN | US | 18th Jan 2022 |
| 2606:a580::/32 | 4.3B × /64 | ARIN | US | 16th Oct 2015 |
| 2606:a640::/32 | 4.3B × /64 | ARIN | US | 19th Jan 2022 |
| 2606:a900::/32 | 4.3B × /64 | ARIN | US | 22nd Dec 2011 |
| 2606:a980::/32 | 4.3B × /64 | ARIN | US | 19th Oct 2015 |
| 2606:a9c0::/32 | 4.3B × /64 | ARIN |  PR | 26th Jan 2022 |
| 2606:aa40::/32 | 4.3B × /64 | ARIN | US | 27th Jan 2022 |
| 2606:aa80::/32 | 4.3B × /64 | ARIN | US | 19th Oct 2015 |
| 2606:ac00::/32 | 4.3B × /64 | ARIN | US | 20th Sept 2010 |
| 2606:ac0::/32 | 4.3B × /64 | ARIN | US | 16th Nov 2020 |
| 2606:ac40::/32 | 4.3B × /64 | ARIN | US | 31st Jan 2022 |
| 2606:ad80::/32 | 4.3B × /64 | ARIN | US | 23rd Oct 2015 |
| 2606:adc0::/32 | 4.3B × /64 | ARIN | US | 3rd Feb 2022 |
| 2606:b000::/32 | 4.3B × /64 | ARIN | US | 2nd Apr 2010 |
| 2606:b0c0::/32 | 4.3B × /64 | ARIN |  CA | 9th Feb 2022 |
| 2606:b100::/32 | 4.3B × /64 | ARIN | US | 27th Dec 2011 |
| 2606:b140::/32 | 4.3B × /64 | ARIN | US | 11th Feb 2022 |
| 2606:b200::/32 | 4.3B × /64 | ARIN |  KY | 14th Feb 2011 |
| 2606:b240::/32 | 4.3B × /64 | ARIN | CA | 11th Feb 2022 |
| 2606:b280::/32 | 4.3B × /64 | ARIN | US | 2nd Nov 2015 |
| 2606:b380::/32 | 4.3B × /64 | ARIN | US | 5th Nov 2015 |
| 2606:b3c0::/32 | 4.3B × /64 | ARIN | US | 14th Feb 2022 |
| 2606:b540::/32 | 4.3B × /64 | ARIN | US | 16th Feb 2022 |