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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 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:f4cc::/40 | 16.8M × /64 | ARIN |  US | 12th Nov 2025 |
| 2602:f4cd::/40 | 16.8M × /64 | ARIN | US | 12th Nov 2025 |
| 2602:f4cf::/40 | 16.8M × /64 | ARIN | US | 10th Nov 2025 |
| 2602:f4d0::/40 | 16.8M × /64 | ARIN | US | 10th Nov 2025 |
| 2602:f4d1::/40 | 16.8M × /64 | ARIN | US | 10th Nov 2025 |
| 2602:f4d4::/40 | 16.8M × /64 | ARIN | US | 7th Nov 2025 |
| 2602:f4d5::/40 | 16.8M × /64 | ARIN | US | 7th Nov 2025 |
| 2602:f4d7::/36 | 268M × /64 | ARIN | US | 6th Nov 2025 |
| 2602:f4d8::/40 | 16.8M × /64 | ARIN | US | 6th Nov 2025 |
| 2602:f4da::/40 | 16.8M × /64 | ARIN | US | 5th Nov 2025 |
| 2602:f4db::/40 | 16.8M × /64 | ARIN | US | 4th Nov 2025 |
| 2602:f4dd::/40 | 16.8M × /64 | ARIN | US | 4th Nov 2025 |
| 2602:f4de::/36 | 268M × /64 | ARIN | US | 4th Nov 2025 |
| 2602:f4e1::/40 | 16.8M × /64 | ARIN | US | 31st Oct 2025 |
| 2602:f4e2::/40 | 16.8M × /64 | ARIN | US | 31st Oct 2025 |
| 2602:f4e4::/40 | 16.8M × /64 | ARIN | US | 31st Oct 2025 |
| 2602:f4e5::/36 | 268M × /64 | ARIN | US | 31st Oct 2025 |
| 2602:f4e6::/40 | 16.8M × /64 | ARIN | US | 31st Oct 2025 |
| 2602:f4e7::/40 | 16.8M × /64 | ARIN | US | 31st Oct 2025 |
| 2602:f4e9::/40 | 16.8M × /64 | ARIN | US | 30th Oct 2025 |
| 2602:f4ea::/40 | 16.8M × /64 | ARIN | US | 30th Oct 2025 |
| 2602:f4eb::/40 | 16.8M × /64 | ARIN | US | 30th Oct 2025 |
| 2602:f4ec::/40 | 16.8M × /64 | ARIN | US | 30th Oct 2025 |
| 2602:f4ed::/40 | 16.8M × /64 | ARIN | US | 30th Oct 2025 |
| 2602:f4ee::/40 | 16.8M × /64 | ARIN | US | 29th Oct 2025 |
| 2602:f4ef::/40 | 16.8M × /64 | ARIN | US | 29th Oct 2025 |
| 2602:f4f3::/40 | 16.8M × /64 | ARIN | US | 28th Oct 2025 |
| 2602:f4f4::/40 | 16.8M × /64 | ARIN | US | 27th Oct 2025 |
| 2602:f4f5::/40 | 16.8M × /64 | ARIN | US | 25th Oct 2025 |
| 2602:f4f6::/40 | 16.8M × /64 | ARIN | US | 24th Oct 2025 |
| 2602:f4f7::/40 | 16.8M × /64 | ARIN | US | 24th Oct 2025 |
| 2602:f4f8::/40 | 16.8M × /64 | ARIN | US | 24th Oct 2025 |
| 2602:f4fa::/40 | 16.8M × /64 | ARIN | US | 24th Oct 2025 |
| 2602:f4fc::/40 | 16.8M × /64 | ARIN | US | 24th Oct 2025 |
| 2602:f4fd::/40 | 16.8M × /64 | ARIN | US | 23rd Oct 2025 |
| 2602:f4fe::/40 | 16.8M × /64 | ARIN | US | 23rd Oct 2025 |
| 2602:f4ff::/40 | 16.8M × /64 | ARIN | US | 23rd Oct 2025 |
| 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:f506::/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:f50d::/36 | 268M × /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 |