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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in United States
26,289 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2602:f5b4::/40 | 16.8M × /64 | ARIN |  US | 30th Jul 2025 |
| 2602:f5b5::/40 | 16.8M × /64 | ARIN | US | 29th Jul 2025 |
| 2602:f5b6::/40 | 16.8M × /64 | ARIN | US | 28th Jul 2025 |
| 2602:f5b7::/40 | 16.8M × /64 | ARIN | US | 25th Jul 2025 |
| 2602:f5b9::/40 | 16.8M × /64 | ARIN | US | 25th Jul 2025 |
| 2602:f5ba::/40 | 16.8M × /64 | ARIN | US | 24th Jul 2025 |
| 2602:f5bc::/40 | 16.8M × /64 | ARIN | US | 23rd Jul 2025 |
| 2602:f5bd::/40 | 16.8M × /64 | ARIN | US | 23rd Jul 2025 |
| 2602:f5bf::/36 | 268M × /64 | ARIN | US | 23rd Jul 2025 |
| 2602:f5c2::/36 | 268M × /64 | ARIN | US | 22nd Jul 2025 |
| 2602:f5c3::/40 | 16.8M × /64 | ARIN | US | 22nd Jul 2025 |
| 2602:f5c4::/40 | 16.8M × /64 | ARIN | US | 22nd Jul 2025 |
| 2602:f5c7::/36 | 268M × /64 | ARIN | US | 21st Jul 2025 |
| 2602:f5c8::/40 | 16.8M × /64 | ARIN | US | 21st Jul 2025 |
| 2602:f5cb::/40 | 16.8M × /64 | ARIN | US | 21st Jul 2025 |
| 2602:f5cc::/40 | 16.8M × /64 | ARIN | US | 21st Jul 2025 |
| 2602:f5cd::/40 | 16.8M × /64 | ARIN | US | 21st Jul 2025 |
| 2602:f5ce::/40 | 16.8M × /64 | ARIN | US | 18th Jul 2025 |
| 2602:f5cf::/40 | 16.8M × /64 | ARIN | US | 18th Jul 2025 |
| 2602:f5d0::/36 | 268M × /64 | ARIN | US | 18th Jul 2025 |
| 2602:f5d2::/40 | 16.8M × /64 | ARIN | US | 17th Jul 2025 |
| 2602:f5d3::/40 | 16.8M × /64 | ARIN | US | 17th Jul 2025 |
| 2602:f5d4::/40 | 16.8M × /64 | ARIN | US | 17th Jul 2025 |
| 2602:f5d5::/40 | 16.8M × /64 | ARIN | US | 17th Jul 2025 |
| 2602:f5d6::/40 | 16.8M × /64 | ARIN | US | 17th Jul 2025 |
| 2602:f5d8::/36 | 268M × /64 | ARIN | US | 16th Jul 2025 |
| 2602:f5d9::/40 | 16.8M × /64 | ARIN | US | 16th Jul 2025 |
| 2602:f5db::/40 | 16.8M × /64 | ARIN | US | 16th Jul 2025 |
| 2602:f5dc::/40 | 16.8M × /64 | ARIN | US | 15th Jul 2025 |
| 2602:f5dd::/40 | 16.8M × /64 | ARIN | US | 15th Jul 2025 |
| 2602:f5de::/40 | 16.8M × /64 | ARIN | US | 15th Jul 2025 |
| 2602:f5df::/36 | 268M × /64 | ARIN | US | 15th Jul 2025 |
| 2602:f5e0::/40 | 16.8M × /64 | ARIN | US | 15th Jul 2025 |
| 2602:f5e1::/40 | 16.8M × /64 | ARIN | US | 14th Jul 2025 |
| 2602:f5e3::/36 | 268M × /64 | ARIN | US | 14th Jul 2025 |
| 2602:f5e4::/40 | 16.8M × /64 | ARIN | US | 14th Jul 2025 |
| 2602:f5e6::/40 | 16.8M × /64 | ARIN | US | 11th Jul 2025 |
| 2602:f5e7::/36 | 268M × /64 | ARIN | US | 11th Jul 2025 |
| 2602:f5e9::/40 | 16.8M × /64 | ARIN | US | 10th Jul 2025 |
| 2602:f5eb::/40 | 16.8M × /64 | ARIN | US | 9th Jul 2025 |
| 2602:f5ec::/36 | 268M × /64 | ARIN | US | 8th Jul 2025 |
| 2602:f5ed::/40 | 16.8M × /64 | ARIN | US | 8th Jul 2025 |
| 2602:f5f0::/40 | 16.8M × /64 | ARIN | US | 8th Jul 2025 |
| 2602:f5f2::/40 | 16.8M × /64 | ARIN | US | 8th Jul 2025 |
| 2602:f5f4::/40 | 16.8M × /64 | ARIN | US | 8th Jul 2025 |
| 2602:f5f5::/40 | 16.8M × /64 | ARIN | US | 8th Jul 2025 |
| 2602:f5f7::/40 | 16.8M × /64 | ARIN | US | 3rd Jul 2025 |
| 2602:f5f8::/36 | 268M × /64 | ARIN | US | 3rd Jul 2025 |
| 2602:f5f9::/40 | 16.8M × /64 | ARIN | US | 2nd Jul 2025 |
| 2602:f5fa::/40 | 16.8M × /64 | ARIN | US | 1st Jul 2025 |