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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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:f720::/40 | 16.8M × /64 | ARIN |  US | 21st Jan 2025 |
| 2602:f721::/40 | 16.8M × /64 | ARIN | US | 21st Jan 2025 |
| 2602:f724::/36 | 268M × /64 | ARIN | US | 17th Jan 2025 |
| 2602:f725::/40 | 16.8M × /64 | ARIN | US | 17th Jan 2025 |
| 2602:f726::/40 | 16.8M × /64 | ARIN | US | 17th Jan 2025 |
| 2602:f727::/40 | 16.8M × /64 | ARIN | US | 17th Jan 2025 |
| 2602:f728::/40 | 16.8M × /64 | ARIN | US | 17th Jan 2025 |
| 2602:f729::/40 | 16.8M × /64 | ARIN | US | 17th Jan 2025 |
| 2602:f72a::/36 | 268M × /64 | ARIN | US | 17th Jan 2025 |
| 2602:f72b::/40 | 16.8M × /64 | ARIN | US | 16th Jan 2025 |
| 2602:f731::/36 | 268M × /64 | ARIN | US | 15th Jan 2025 |
| 2602:f733::/40 | 16.8M × /64 | ARIN | US | 15th Jan 2025 |
| 2602:f734::/40 | 16.8M × /64 | ARIN | US | 15th Jan 2025 |
| 2602:f735::/36 | 268M × /64 | ARIN | US | 15th Jan 2025 |
| 2602:f738::/40 | 16.8M × /64 | ARIN |  CA | 13th Jan 2025 |
| 2602:f73a::/36 | 268M × /64 | ARIN |  GB | 10th Jan 2025 |
| 2602:f73f::/36 | 268M × /64 | ARIN | US | 9th Jan 2025 |
| 2602:f740::/36 | 268M × /64 | ARIN |  VN | 9th Jan 2025 |
| 2602:f741::/36 | 268M × /64 | ARIN |  SG | 9th Jan 2025 |
| 2602:f746::/36 | 268M × /64 | ARIN | US | 6th Jan 2025 |
| 2602:f747::/40 | 16.8M × /64 | ARIN | US | 6th Jan 2025 |
| 2602:f748::/32 | 4.3B × /64 | ARIN | US | 3rd Jan 2025 |
| 2602:f74a::/36 | 268M × /64 | ARIN | US | 2nd Jan 2025 |
| 2602:f74b::/40 | 16.8M × /64 | ARIN | US | 31st Dec 2024 |
| 2602:f74e::/40 | 16.8M × /64 | ARIN | US | 30th Dec 2024 |
| 2602:f74f::/36 | 268M × /64 | ARIN | SG | 30th Dec 2024 |
| 2602:f750::/40 | 16.8M × /64 | ARIN | US | 30th Dec 2024 |
| 2602:f751::/36 | 268M × /64 | ARIN | US | 30th Dec 2024 |
| 2602:f753::/36 | 268M × /64 | ARIN | GB | 30th Dec 2024 |
| 2602:f755::/40 | 16.8M × /64 | ARIN | US | 30th Dec 2024 |
| 2602:f756::/40 | 16.8M × /64 | ARIN | US | 27th Dec 2024 |
| 2602:f759::/40 | 16.8M × /64 | ARIN | US | 26th Dec 2024 |
| 2602:f75d::/36 | 268M × /64 | ARIN |  JP | 19th Dec 2024 |
| 2602:f75e::/36 | 268M × /64 | ARIN | US | 19th Dec 2024 |
| 2602:f760::/36 | 268M × /64 | ARIN | US | 18th Dec 2024 |
| 2602:f762::/40 | 16.8M × /64 | ARIN | US | 18th Dec 2024 |
| 2602:f768::/36 | 268M × /64 | ARIN | US | 16th Dec 2024 |
| 2602:f76a::/36 | 268M × /64 | ARIN | US | 12th Dec 2024 |
| 2602:f76c::/36 | 268M × /64 | ARIN | US | 11th Dec 2024 |
| 2602:f76d::/36 | 268M × /64 | ARIN | US | 11th Dec 2024 |
| 2602:f76e::/36 | 268M × /64 | ARIN | US | 11th Dec 2024 |
| 2602:f770::/36 | 268M × /64 | ARIN | US | 10th Dec 2024 |
| 2602:f771::/40 | 16.8M × /64 | ARIN | US | 10th Dec 2024 |
| 2602:f772::/36 | 268M × /64 | ARIN | CA | 10th Dec 2024 |
| 2602:f776::/40 | 16.8M × /64 | ARIN | US | 5th Dec 2024 |
| 2602:f777::/36 | 268M × /64 | ARIN | CA | 5th Dec 2024 |
| 2602:f778::/40 | 16.8M × /64 | ARIN | US | 4th Dec 2024 |
| 2602:f77a::/36 | 268M × /64 | ARIN | US | 3rd Dec 2024 |
| 2602:f77b::/36 | 268M × /64 | ARIN | US | 3rd Dec 2024 |
| 2602:f77d::/36 | 268M × /64 | ARIN | US | 2nd Dec 2024 |