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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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:f397::/40 | 16.8M × /64 | ARIN |  TH | 8th Jun 2026 |
| 2602:f398::/40 | 16.8M × /64 | ARIN |  US | 8th Jun 2026 |
| 2602:f399::/36 | 268M × /64 | ARIN | US | 5th Jun 2026 |
| 2602:f39a::/40 | 16.8M × /64 | ARIN | US | 4th Jun 2026 |
| 2602:f39b::/36 | 268M × /64 | ARIN | US | 4th Jun 2026 |
| 2602:f39d::/36 | 268M × /64 | ARIN | US | 2nd Jun 2026 |
| 2602:f39e::/40 | 16.8M × /64 | ARIN | US | 2nd Jun 2026 |
| 2602:f3a0::/40 | 16.8M × /64 | ARIN |  PH | 1st Jun 2026 |
| 2602:f3a1::/40 | 16.8M × /64 | ARIN | US | 1st Jun 2026 |
| 2602:f3a2::/40 | 16.8M × /64 | ARIN | TH | 1st Jun 2026 |
| 2602:f3a3::/40 | 16.8M × /64 | ARIN | US | 1st Jun 2026 |
| 2602:f3a4::/40 | 16.8M × /64 | ARIN |  CA | 29th May 2026 |
| 2602:f3a5::/40 | 16.8M × /64 | ARIN | US | 28th May 2026 |
| 2602:f3a7::/40 | 16.8M × /64 | ARIN | US | 28th May 2026 |
| 2602:f3a8::/40 | 16.8M × /64 | ARIN | US | 27th May 2026 |
| 2602:f3aa::/36 | 268M × /64 | ARIN | CA | 27th May 2026 |
| 2602:f3ab::/40 | 16.8M × /64 | ARIN | US | 27th May 2026 |
| 2602:f3ac::/40 | 16.8M × /64 | ARIN | US | 27th May 2026 |
| 2602:f3ad::/36 | 268M × /64 | ARIN | US | 27th May 2026 |
| 2602:f3af::/40 | 16.8M × /64 | ARIN | US | 26th May 2026 |
| 2602:f3b0::/36 | 268M × /64 | ARIN | US | 22nd May 2026 |
| 2602:f3b1::/40 | 16.8M × /64 | ARIN | US | 22nd May 2026 |
| 2602:f3b2::/40 | 16.8M × /64 | ARIN | US | 22nd May 2026 |
| 2602:f3b3::/40 | 16.8M × /64 | ARIN | US | 21st May 2026 |
| 2602:f3b8::/40 | 16.8M × /64 | ARIN | TH | 19th May 2026 |
| 2602:f3b9::/36 | 268M × /64 | ARIN | CA | 18th May 2026 |
| 2602:f3bb::/36 | 268M × /64 | ARIN | US | 15th May 2026 |
| 2602:f3bc::/40 | 16.8M × /64 | ARIN |  SG | 15th May 2026 |
| 2602:f3bd::/40 | 16.8M × /64 | ARIN | US | 15th May 2026 |
| 2602:f3be::/36 | 268M × /64 | ARIN | US | 15th May 2026 |
| 2602:f3bf::/40 | 16.8M × /64 | ARIN | US | 15th May 2026 |
| 2602:f3c0::/40 | 16.8M × /64 | ARIN | US | 14th May 2026 |
| 2602:f3c3::/40 | 16.8M × /64 | ARIN | US | 13th May 2026 |
| 2602:f3c5::/40 | 16.8M × /64 | ARIN | CA | 12th May 2026 |
| 2602:f3c6::/40 | 16.8M × /64 | ARIN | US | 12th May 2026 |
| 2602:f3c8::/40 | 16.8M × /64 | ARIN | US | 11th May 2026 |
| 2602:f3c9::/40 | 16.8M × /64 | ARIN | US | 11th May 2026 |
| 2602:f3ca::/40 | 16.8M × /64 | ARIN | US | 8th May 2026 |
| 2602:f3cd::/36 | 268M × /64 | ARIN | US | 6th May 2026 |
| 2602:f3ce::/40 | 16.8M × /64 | ARIN | PH | 5th May 2026 |
| 2602:f3cf::/40 | 16.8M × /64 | ARIN | US | 5th May 2026 |
| 2602:f3d0::/40 | 16.8M × /64 | ARIN | US | 5th May 2026 |
| 2602:f3d1::/40 | 16.8M × /64 | ARIN | CA | 4th May 2026 |
| 2602:f3d2::/40 | 16.8M × /64 | ARIN | CA | 1st May 2026 |
| 2602:f3d3::/40 | 16.8M × /64 | ARIN | US | 1st May 2026 |
| 2602:f3d5::/40 | 16.8M × /64 | ARIN | US | 30th Apr 2026 |
| 2602:f3d6::/40 | 16.8M × /64 | ARIN | CA | 29th Apr 2026 |
| 2602:f3d7::/36 | 268M × /64 | ARIN | US | 29th Apr 2026 |
| 2602:f3da::/36 | 268M × /64 | ARIN | US | 28th Apr 2026 |
| 2602:f3dd::/40 | 16.8M × /64 | ARIN | US | 27th Apr 2026 |