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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through ARIN, largest first.
Unannounced blocks registered through ARIN
30,449 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2602:f544::/36 | 268M × /64 | ARIN |  CA | 29th Sept 2025 |
| 2602:f545::/36 | 268M × /64 | ARIN |  US | 29th Sept 2025 |
| 2602:f546::/40 | 16.8M × /64 | ARIN | US | 29th Sept 2025 |
| 2602:f548::/40 | 16.8M × /64 | ARIN |  SG | 26th Sept 2025 |
| 2602:f54b::/40 | 16.8M × /64 | ARIN | US | 25th Sept 2025 |
| 2602:f54d::/40 | 16.8M × /64 | ARIN | US | 23rd Sept 2025 |
| 2602:f550::/40 | 16.8M × /64 | ARIN | US | 22nd Sept 2025 |
| 2602:f552::/40 | 16.8M × /64 | ARIN | US | 22nd Sept 2025 |
| 2602:f554::/36 | 268M × /64 | ARIN | CA | 19th Sept 2025 |
| 2602:f555::/40 | 16.8M × /64 | ARIN | CA | 19th Sept 2025 |
| 2602:f556::/40 | 16.8M × /64 | ARIN | US | 18th Sept 2025 |
| 2602:f559::/40 | 16.8M × /64 | ARIN | US | 17th Sept 2025 |
| 2602:f55a::/40 | 16.8M × /64 | ARIN | US | 17th Sept 2025 |
| 2602:f55c::/40 | 16.8M × /64 | ARIN | US | 17th Sept 2025 |
| 2602:f55e::/40 | 16.8M × /64 | ARIN | US | 17th Sept 2025 |
| 2602:f55f::/36 | 268M × /64 | ARIN | US | 16th Sept 2025 |
| 2602:f560::/40 | 16.8M × /64 | ARIN | US | 15th Sept 2025 |
| 2602:f561::/40 | 16.8M × /64 | ARIN | US | 15th Sept 2025 |
| 2602:f562::/36 | 268M × /64 | ARIN | US | 15th Sept 2025 |
| 2602:f563::/40 | 16.8M × /64 | ARIN | US | 11th Sept 2025 |
| 2602:f564::/40 | 16.8M × /64 | ARIN | US | 11th Sept 2025 |
| 2602:f565::/36 | 268M × /64 | ARIN | US | 11th Sept 2025 |
| 2602:f566::/40 | 16.8M × /64 | ARIN | US | 11th Sept 2025 |
| 2602:f568::/40 | 16.8M × /64 | ARIN | US | 11th Sept 2025 |
| 2602:f569::/40 | 16.8M × /64 | ARIN | US | 11th Sept 2025 |
| 2602:f56b::/40 | 16.8M × /64 | ARIN | US | 10th Sept 2025 |
| 2602:f56c::/40 | 16.8M × /64 | ARIN | US | 10th Sept 2025 |
| 2602:f56f::/40 | 16.8M × /64 | ARIN | US | 8th Sept 2025 |
| 2602:f570::/40 | 16.8M × /64 | ARIN | US | 8th Sept 2025 |
| 2602:f571::/40 | 16.8M × /64 | ARIN | US | 8th Sept 2025 |
| 2602:f572::/40 | 16.8M × /64 | ARIN | US | 5th Sept 2025 |
| 2602:f574::/40 | 16.8M × /64 | ARIN | US | 4th Sept 2025 |
| 2602:f575::/40 | 16.8M × /64 | ARIN | US | 4th Sept 2025 |
| 2602:f576::/40 | 16.8M × /64 | ARIN | US | 4th Sept 2025 |
| 2602:f578::/40 | 16.8M × /64 | ARIN | US | 2nd Sept 2025 |
| 2602:f579::/36 | 268M × /64 | ARIN |  VN | 2nd Sept 2025 |
| 2602:f57a::/40 | 16.8M × /64 | ARIN | US | 2nd Sept 2025 |
| 2602:f57b::/40 | 16.8M × /64 | ARIN | US | 2nd Sept 2025 |
| 2602:f57c::/40 | 16.8M × /64 | ARIN | US | 2nd Sept 2025 |
| 2602:f57e::/36 | 268M × /64 | ARIN | US | 29th Aug 2025 |
| 2602:f580::/40 | 16.8M × /64 | ARIN | US | 28th Aug 2025 |
| 2602:f581::/36 | 268M × /64 | ARIN | US | 27th Aug 2025 |
| 2602:f582::/40 | 16.8M × /64 | ARIN | US | 26th Aug 2025 |
| 2602:f583::/36 | 268M × /64 | ARIN | US | 26th Aug 2025 |
| 2602:f584::/40 | 16.8M × /64 | ARIN | US | 26th Aug 2025 |
| 2602:f588::/40 | 16.8M × /64 | ARIN | US | 22nd Aug 2025 |
| 2602:f589::/36 | 268M × /64 | ARIN | US | 22nd Aug 2025 |
| 2602:f58a::/40 | 16.8M × /64 | ARIN | US | 22nd Aug 2025 |
| 2602:f58b::/40 | 16.8M × /64 | ARIN | US | 21st Aug 2025 |
| 2602:f58c::/40 | 16.8M × /64 | ARIN | US | 21st Aug 2025 |