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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 2606:4ac0::/32 | 4.3B × /64 | ARIN |  CA | 29th Apr 2021 |
| 2606:4b80::/32 | 4.3B × /64 | ARIN |  US | 14th Jul 2015 |
| 2606:4c00::/33 | 2.1B × /64 | ARIN | US | 9th Sept 2010 |
| 2606:4c0::/32 | 4.3B × /64 | ARIN | US | 28th Oct 2020 |
| 2606:4e40::/32 | 4.3B × /64 | ARIN | US | 10th May 2021 |
| 2606:4ec0::/32 | 4.3B × /64 | ARIN | US | 11th May 2021 |
| 2606:500::/32 | 4.3B × /64 | ARIN | US | 20th Sept 2011 |
| 2606:5140::/32 | 4.3B × /64 | ARIN | US | 20th May 2021 |
| 2606:5180::/32 | 4.3B × /64 | ARIN | US | 8th May 2026 |
| 2606:51c0::/32 | 4.3B × /64 | ARIN | US | 21st May 2021 |
| 2606:5280::/32 | 4.3B × /64 | ARIN | US | 17th Jul 2015 |
| 2606:52c0::/32 | 4.3B × /64 | ARIN | US | 21st May 2021 |
| 2606:5380::/32 | 4.3B × /64 | ARIN | US | 20th Jul 2015 |
| 2606:53c0::/32 | 4.3B × /64 | ARIN | US | 24th May 2021 |
| 2606:5400::/32 | 4.3B × /64 | ARIN | US | 9th Sept 2010 |
| 2606:540::/32 | 4.3B × /64 | ARIN | US | 29th Oct 2020 |
| 2606:5580::/32 | 4.3B × /64 | ARIN | US | 21st Jul 2015 |
| 2606:5640::/32 | 4.3B × /64 | ARIN | US | 3rd Jun 2021 |
| 2606:5740::/32 | 4.3B × /64 | ARIN | US | 3rd Jun 2021 |
| 2606:5800::/32 | 4.3B × /64 | ARIN | US | 20th May 2010 |
| 2606:580::/32 | 4.3B × /64 | ARIN | US | 5th Mar 2015 |
| 2606:5840::/32 | 4.3B × /64 | ARIN | US | 9th Jun 2021 |
| 2606:59c0::/32 | 4.3B × /64 | ARIN | US | 15th Jun 2021 |
| 2606:5a00::/32 | 4.3B × /64 | ARIN |  VI | 2nd Jun 2014 |
| 2606:5a80::/32 | 4.3B × /64 | ARIN | US | 22nd Jul 2015 |
| 2606:5c00::/32 | 4.3B × /64 | ARIN | US | 10th Sept 2010 |
| 2606:5c0::/32 | 4.3B × /64 | ARIN | US | 29th Oct 2020 |
| 2606:5c40::/32 | 4.3B × /64 | ARIN | US | 25th Jun 2021 |
| 2606:5d40::/32 | 4.3B × /64 | ARIN | US | 29th Jun 2021 |
| 2606:5ec0::/32 | 4.3B × /64 | ARIN | US | 2nd Jul 2021 |
| 2606:5f40::/32 | 4.3B × /64 | ARIN | US | 8th Jul 2021 |
| 2606:5fc0::/32 | 4.3B × /64 | ARIN | CA | 8th Jul 2021 |
| 2606:60c0::/32 | 4.3B × /64 | ARIN | CA | 9th Jul 2021 |
| 2606:6180::/32 | 4.3B × /64 | ARIN | CA | 11th May 2026 |
| 2606:61c0::/32 | 4.3B × /64 | ARIN | US | 12th Jul 2021 |
| 2606:62c0::/32 | 4.3B × /64 | ARIN | US | 13th Jul 2021 |
| 2606:6340::/32 | 4.3B × /64 | ARIN | US | 14th May 2026 |
| 2606:6400::/32 | 4.3B × /64 | ARIN | US | 13th Sept 2010 |
| 2606:64c0::/32 | 4.3B × /64 | ARIN | CA | 21st Jul 2021 |
| 2606:6540::/32 | 4.3B × /64 | ARIN | US | 21st Jul 2021 |
| 2606:6600::/32 | 4.3B × /64 | ARIN | US | 8th Feb 2011 |
| 2606:6640::/32 | 4.3B × /64 | ARIN | US | 18th May 2026 |
| 2606:66c0::/32 | 4.3B × /64 | ARIN | US | 28th Jul 2021 |
| 2606:6700::/32 | 4.3B × /64 | ARIN | US | 14th Nov 2011 |
| 2606:6780::/32 | 4.3B × /64 | ARIN | CA | 18th Aug 2015 |
| 2606:6840::/32 | 4.3B × /64 | ARIN | US | 6th Aug 2021 |
| 2606:6940::/32 | 4.3B × /64 | ARIN | US | 9th Aug 2021 |
| 2606:6980::/32 | 4.3B × /64 | ARIN | US | 19th Aug 2015 |
| 2606:6b00::/32 | 4.3B × /64 | ARIN | US | 15th Nov 2011 |
| 2606:6b80::/32 | 4.3B × /64 | ARIN | US | 24th Aug 2015 |