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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
Browse by registry
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Countries with the most unannounced blocks, largest first.
Unannounced blocks in United States
27,007 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2602:f637::/40 | 16.8M × /64 | ARIN |  US | 28th May 2025 |
| 2602:f638::/40 | 16.8M × /64 | ARIN | US | 28th May 2025 |
| 2602:f63c::/40 | 16.8M × /64 | ARIN | US | 22nd May 2025 |
| 2602:f63d::/40 | 16.8M × /64 | ARIN | US | 22nd May 2025 |
| 2602:f641::/40 | 16.8M × /64 | ARIN | US | 21st May 2025 |
| 2602:f642::/40 | 16.8M × /64 | ARIN | US | 21st May 2025 |
| 2602:f643::/40 | 16.8M × /64 | ARIN | US | 21st May 2025 |
| 2602:f645::/40 | 16.8M × /64 | ARIN | US | 20th May 2025 |
| 2602:f647::/40 | 16.8M × /64 | ARIN | US | 16th May 2025 |
| 2602:f648::/40 | 16.8M × /64 | ARIN | US | 16th May 2025 |
| 2602:f649::/36 | 268M × /64 | ARIN | US | 9th Jan 2026 |
| 2602:f64a::/40 | 16.8M × /64 | ARIN | US | 15th May 2025 |
| 2602:f64b::/36 | 268M × /64 | ARIN | US | 15th May 2025 |
| 2602:f64e::/40 | 16.8M × /64 | ARIN | US | 13th May 2025 |
| 2602:f64f::/40 | 16.8M × /64 | ARIN | US | 12th May 2025 |
| 2602:f653::/40 | 16.8M × /64 | ARIN | US | 8th May 2025 |
| 2602:f654::/40 | 16.8M × /64 | ARIN | US | 8th May 2025 |
| 2602:f658::/40 | 16.8M × /64 | ARIN | US | 7th May 2025 |
| 2602:f659::/36 | 268M × /64 | ARIN | US | 7th May 2025 |
| 2602:f65a::/40 | 16.8M × /64 | ARIN | US | 6th May 2025 |
| 2602:f65c::/40 | 16.8M × /64 | ARIN | US | 6th May 2025 |
| 2602:f65d::/40 | 16.8M × /64 | ARIN | US | 5th May 2025 |
| 2602:f662::/36 | 268M × /64 | ARIN | US | 29th Apr 2025 |
| 2602:f663::/40 | 16.8M × /64 | ARIN | US | 29th Apr 2025 |
| 2602:f665::/40 | 16.8M × /64 | ARIN | US | 29th Apr 2025 |
| 2602:f667::/36 | 268M × /64 | ARIN | US | 25th Apr 2025 |
| 2602:f668::/36 | 268M × /64 | ARIN | US | 25th Apr 2025 |
| 2602:f66c::/40 | 16.8M × /64 | ARIN | US | 23rd Apr 2025 |
| 2602:f66d::/40 | 16.8M × /64 | ARIN | US | 23rd Apr 2025 |
| 2602:f66e::/40 | 16.8M × /64 | ARIN | US | 23rd Apr 2025 |
| 2602:f672::/40 | 16.8M × /64 | ARIN | US | 21st Apr 2025 |
| 2602:f673::/40 | 16.8M × /64 | ARIN | US | 18th Apr 2025 |
| 2602:f675::/36 | 268M × /64 | ARIN | US | 18th Apr 2025 |
| 2602:f676::/40 | 16.8M × /64 | ARIN | US | 18th Apr 2025 |
| 2602:f677::/36 | 268M × /64 | ARIN | US | 18th Apr 2025 |
| 2602:f679::/40 | 16.8M × /64 | ARIN | US | 17th Apr 2025 |
| 2602:f67a::/40 | 16.8M × /64 | ARIN | US | 17th Apr 2025 |
| 2602:f67b::/40 | 16.8M × /64 | ARIN | US | 17th Apr 2025 |
| 2602:f67d::/40 | 16.8M × /64 | ARIN | US | 16th Apr 2025 |
| 2602:f67f::/40 | 16.8M × /64 | ARIN | US | 16th Apr 2025 |
| 2602:f681::/40 | 16.8M × /64 | ARIN | US | 14th Apr 2025 |
| 2602:f682::/36 | 268M × /64 | ARIN | US | 14th Apr 2025 |
| 2602:f683::/40 | 16.8M × /64 | ARIN | US | 14th Apr 2025 |
| 2602:f684::/40 | 16.8M × /64 | ARIN | US | 14th Apr 2025 |
| 2602:f686::/40 | 16.8M × /64 | ARIN | US | 11th Apr 2025 |
| 2602:f68b::/40 | 16.8M × /64 | ARIN | US | 9th Apr 2025 |
| 2602:f68c::/40 | 16.8M × /64 | ARIN | US | 9th Apr 2025 |
| 2602:f68e::/40 | 16.8M × /64 | ARIN | US | 8th Apr 2025 |
| 2602:f690::/40 | 16.8M × /64 | ARIN | US | 4th Apr 2025 |
| 2602:f691::/40 | 16.8M × /64 | ARIN | US | 9th Jan 2026 |