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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
Browse by country
Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,256 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 2602:f3e0::/40 | 16.8M × /64 | ARIN | US | 27th Apr 2026 |
| 2602:f3e1::/36 | 268M × /64 | ARIN | US | 27th Apr 2026 |
| 2602:f3e2::/36 | 268M × /64 | ARIN | US | 24th Apr 2026 |
| 2602:f3e4::/40 | 16.8M × /64 | ARIN | US | 24th Apr 2026 |
| 2602:f3e6::/36 | 268M × /64 | ARIN | US | 22nd Apr 2026 |
| 2602:f3e9::/36 | 268M × /64 | ARIN | US | 21st Apr 2026 |
| 2602:f3ea::/40 | 16.8M × /64 | ARIN | US | 21st Apr 2026 |
| 2602:f3ec::/40 | 16.8M × /64 | ARIN | US | 20th Apr 2026 |
| 2602:f3ed::/40 | 16.8M × /64 | ARIN | US | 17th Apr 2026 |
| 2602:f3ef::/40 | 16.8M × /64 | ARIN | CA | 16th Apr 2026 |
| 2602:f3f1::/36 | 268M × /64 | ARIN | CA | 15th Apr 2026 |
| 2602:f3f5::/40 | 16.8M × /64 | ARIN |  PH | 13th Apr 2026 |
| 2602:f3f6::/40 | 16.8M × /64 | ARIN | US | 13th Apr 2026 |
| 2602:f3f7::/40 | 16.8M × /64 | ARIN | US | 13th Apr 2026 |
| 2602:f3f8::/40 | 16.8M × /64 | ARIN |  TH | 10th Apr 2026 |
| 2602:f3f9::/40 | 16.8M × /64 | ARIN | US | 10th Apr 2026 |
| 2602:f3fa::/40 | 16.8M × /64 | ARIN | US | 10th Apr 2026 |
| 2602:f3fc::/36 | 268M × /64 | ARIN |  KN | 10th Apr 2026 |
| 2602:f3fd::/40 | 16.8M × /64 | ARIN | US | 9th Apr 2026 |
| 2602:f400::/40 | 16.8M × /64 | ARIN | US | 8th Apr 2026 |
| 2602:f401::/40 | 16.8M × /64 | ARIN | US | 8th Apr 2026 |
| 2602:f402::/40 | 16.8M × /64 | ARIN |  SG | 7th Apr 2026 |
| 2602:f403::/36 | 268M × /64 | ARIN | US | 7th Apr 2026 |
| 2602:f404::/40 | 16.8M × /64 | ARIN | US | 7th Apr 2026 |
| 2602:f405::/36 | 268M × /64 | ARIN | US | 7th Apr 2026 |
| 2602:f407::/40 | 16.8M × /64 | ARIN | US | 6th Apr 2026 |
| 2602:f408::/40 | 16.8M × /64 | ARIN | US | 6th Apr 2026 |
| 2602:f409::/40 | 16.8M × /64 | ARIN | US | 6th Apr 2026 |
| 2602:f40c::/40 | 16.8M × /64 | ARIN | US | 1st Apr 2026 |
| 2602:f40e::/40 | 16.8M × /64 | ARIN | US | 1st Apr 2026 |
| 2602:f40f::/40 | 16.8M × /64 | ARIN | US | 31st Mar 2026 |
| 2602:f410::/40 | 16.8M × /64 | ARIN | US | 30th Mar 2026 |
| 2602:f413::/36 | 268M × /64 | ARIN | US | 30th Mar 2026 |
| 2602:f415::/36 | 268M × /64 | ARIN | US | 26th Mar 2026 |
| 2602:f416::/40 | 16.8M × /64 | ARIN |  MY | 26th Mar 2026 |
| 2602:f418::/40 | 16.8M × /64 | ARIN | US | 25th Mar 2026 |
| 2602:f419::/40 | 16.8M × /64 | ARIN | US | 24th Mar 2026 |
| 2602:f41a::/40 | 16.8M × /64 | ARIN | CA | 23rd Mar 2026 |
| 2602:f41b::/40 | 16.8M × /64 | ARIN | US | 23rd Mar 2026 |
| 2602:f41d::/40 | 16.8M × /64 | ARIN | TH | 20th Mar 2026 |
| 2602:f41e::/40 | 16.8M × /64 | ARIN | MY | 20th Mar 2026 |
| 2602:f420::/40 | 16.8M × /64 | ARIN | PH | 18th Mar 2026 |
| 2602:f421::/40 | 16.8M × /64 | ARIN | US | 18th Mar 2026 |
| 2602:f422::/40 | 16.8M × /64 | ARIN | US | 18th Mar 2026 |
| 2602:f423::/40 | 16.8M × /64 | ARIN | US | 17th Mar 2026 |