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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,432 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2602:f500::/40 | 16.8M × /64 | ARIN |  US | 22nd Oct 2025 |
| 2602:f501::/40 | 16.8M × /64 | ARIN | US | 22nd Oct 2025 |
| 2602:f502::/40 | 16.8M × /64 | ARIN | US | 22nd Oct 2025 |
| 2602:f503::/40 | 16.8M × /64 | ARIN | US | 22nd Oct 2025 |
| 2602:f507::/40 | 16.8M × /64 | ARIN | US | 22nd Oct 2025 |
| 2602:f508::/40 | 16.8M × /64 | ARIN | US | 22nd Oct 2025 |
| 2602:f509::/40 | 16.8M × /64 | ARIN | US | 21st Oct 2025 |
| 2602:f50b::/40 | 16.8M × /64 | ARIN | US | 20th Oct 2025 |
| 2602:f50e::/40 | 16.8M × /64 | ARIN | US | 20th Oct 2025 |
| 2602:f50f::/40 | 16.8M × /64 | ARIN | US | 16th Oct 2025 |
| 2602:f510::/40 | 16.8M × /64 | ARIN | US | 16th Oct 2025 |
| 2602:f511::/40 | 16.8M × /64 | ARIN | US | 16th Oct 2025 |
| 2602:f514::/40 | 16.8M × /64 | ARIN | US | 15th Oct 2025 |
| 2602:f515::/40 | 16.8M × /64 | ARIN | US | 15th Oct 2025 |
| 2602:f516::/36 | 268M × /64 | ARIN | US | 15th Oct 2025 |
| 2602:f519::/40 | 16.8M × /64 | ARIN | US | 14th Oct 2025 |
| 2602:f51a::/40 | 16.8M × /64 | ARIN | US | 14th Oct 2025 |
| 2602:f51b::/40 | 16.8M × /64 | ARIN | US | 14th Oct 2025 |
| 2602:f51c::/40 | 16.8M × /64 | ARIN | US | 13th Oct 2025 |
| 2602:f51d::/40 | 16.8M × /64 | ARIN | US | 13th Oct 2025 |
| 2602:f51e::/40 | 16.8M × /64 | ARIN | US | 13th Oct 2025 |
| 2602:f521::/36 | 268M × /64 | ARIN | US | 10th Oct 2025 |
| 2602:f522::/40 | 16.8M × /64 | ARIN | US | 10th Oct 2025 |
| 2602:f526::/36 | 268M × /64 | ARIN | US | 8th Oct 2025 |
| 2602:f527::/40 | 16.8M × /64 | ARIN | US | 8th Oct 2025 |
| 2602:f529::/40 | 16.8M × /64 | ARIN | US | 8th Oct 2025 |
| 2602:f52c::/40 | 16.8M × /64 | ARIN | US | 7th Oct 2025 |
| 2602:f52e::/40 | 16.8M × /64 | ARIN | US | 6th Oct 2025 |
| 2602:f52f::/40 | 16.8M × /64 | ARIN | US | 6th Oct 2025 |
| 2602:f530::/40 | 16.8M × /64 | ARIN | US | 3rd Oct 2025 |
| 2602:f533::/40 | 16.8M × /64 | ARIN | US | 2nd Oct 2025 |
| 2602:f534::/40 | 16.8M × /64 | ARIN | US | 2nd Oct 2025 |
| 2602:f536::/40 | 16.8M × /64 | ARIN | US | 2nd Oct 2025 |
| 2602:f537::/40 | 16.8M × /64 | ARIN | US | 1st Oct 2025 |
| 2602:f538::/40 | 16.8M × /64 | ARIN | US | 1st Oct 2025 |
| 2602:f53b::/40 | 16.8M × /64 | ARIN | US | 1st Oct 2025 |
| 2602:f53d::/40 | 16.8M × /64 | ARIN | US | 30th Sept 2025 |
| 2602:f53f::/40 | 16.8M × /64 | ARIN | US | 30th Sept 2025 |
| 2602:f540::/40 | 16.8M × /64 | ARIN | US | 30th Sept 2025 |
| 2602:f541::/36 | 268M × /64 | ARIN | US | 30th Sept 2025 |
| 2602:f543::/36 | 268M × /64 | ARIN | US | 29th Sept 2025 |
| 2602:f544::/36 | 268M × /64 | ARIN |  CA | 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:f549::/36 | 268M × /64 | ARIN | US | 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 |