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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,256 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2601:1100::/28 | 68.7B × /64 | ARIN |  US | 9th May 2022 |
| 2601:1500::/28 | 68.7B × /64 | ARIN | US | 15th Feb 2023 |
| 2601:1800::/28 | 68.7B × /64 | ARIN | US | 6th Oct 2023 |
| 2601:1a00::/24 | 1.1T × /64 | ARIN | US | 1st Apr 2024 |
| 2601:1b00::/24 | 1.1T × /64 | ARIN | US | 18th Apr 2024 |
| 2601:1e00::/24 | 1.1T × /64 | ARIN | US | 13th Jun 2024 |
| 2601:3000::/28 | 68.7B × /64 | ARIN | US | 29th Aug 2024 |
| 2601:7000::/28 | 68.7B × /64 | ARIN | US | 3rd Jun 2025 |
| 2601:e000::/24 | 1.1T × /64 | ARIN | US | 10th Apr 2023 |
| 2601:f000::/24 | 1.1T × /64 | ARIN | US | 6th Jul 2023 |
| 2602:234::/36 | 268M × /64 | ARIN | US | 20th Sept 2023 |
| 2602:270::/36 | 268M × /64 | ARIN | US | 20th Dec 2021 |
| 2602:272::/36 | 268M × /64 | ARIN | US | 25th Jan 2022 |
| 2602:273::/36 | 268M × /64 | ARIN | US | 9th Feb 2022 |
| 2602:275::/36 | 268M × /64 | ARIN | US | 6th May 2022 |
| 2602:276::/32 | 4.3B × /64 | ARIN | US | 26th May 2022 |
| 2602:27b::/32 | 4.3B × /64 | ARIN | US | 27th Oct 2022 |
| 2602:27d::/36 | 268M × /64 | ARIN | US | 27th Oct 2022 |
| 2602:27e::/40 | 16.8M × /64 | ARIN | US | 27th Oct 2022 |
| 2602:27f::/36 | 268M × /64 | ARIN | US | 27th Oct 2022 |
| 2602:290::/36 | 268M × /64 | ARIN | US | 28th Oct 2022 |
| 2602:292::/40 | 16.8M × /64 | ARIN | US | 28th Oct 2022 |
| 2602:298::/36 | 268M × /64 | ARIN | US | 13th Jan 2023 |
| 2602:29a::/40 | 16.8M × /64 | ARIN | US | 18th Jan 2023 |
| 2602:29b::/40 | 16.8M × /64 | ARIN | US | 18th Jan 2023 |
| 2602:29d::/36 | 268M × /64 | ARIN | US | 19th Jan 2023 |
| 2602:2a7::/36 | 268M × /64 | ARIN | US | 6th Mar 2023 |
| 2602:2ab::/36 | 268M × /64 | ARIN | US | 6th Mar 2023 |
| 2602:2ae::/36 | 268M × /64 | ARIN | US | 7th Mar 2023 |
| 2602:2b8::/40 | 16.8M × /64 | ARIN | US | 22nd Mar 2023 |
| 2602:2b9::/40 | 16.8M × /64 | ARIN | US | 3rd Apr 2023 |
| 2602:2bd::/36 | 268M × /64 | ARIN |  CA | 5th Apr 2023 |
| 2602:2bf::/36 | 268M × /64 | ARIN | US | 7th Apr 2023 |
| 2602:2c0::/36 | 268M × /64 | ARIN | CA | 7th Apr 2023 |
| 2602:2c1::/36 | 268M × /64 | ARIN | US | 18th Apr 2023 |
| 2602:2c2::/36 | 268M × /64 | ARIN | US | 18th Apr 2023 |
| 2602:2c4::/40 | 16.8M × /64 | ARIN | CA | 19th Apr 2023 |
| 2602:2c6::/36 | 268M × /64 | ARIN | US | 19th Apr 2023 |
| 2602:2ca::/40 | 16.8M × /64 | ARIN | CA | 24th Apr 2023 |
| 2602:2cb::/36 | 268M × /64 | ARIN | US | 24th Apr 2023 |
| 2602:2cc::/36 | 268M × /64 | ARIN | US | 24th Apr 2023 |
| 2602:2ce::/36 | 268M × /64 | ARIN | US | 1st May 2023 |
| 2602:2cf::/36 | 268M × /64 | ARIN | US | 3rd May 2023 |
| 2602:2d4::/36 | 268M × /64 | ARIN | US | 5th May 2023 |
| 2602:2d7::/36 | 268M × /64 | ARIN | US | 15th May 2023 |
| 2602:2db::/36 | 268M × /64 | ARIN | US | 17th May 2023 |
| 2602:2dc::/36 | 268M × /64 | ARIN | US | 18th May 2023 |
| 2602:2df::/36 | 268M × /64 | ARIN | US | 19th May 2023 |
| 2602:2e3::/40 | 16.8M × /64 | ARIN | US | 31st May 2023 |
| 2602:2ec::/40 | 16.8M × /64 | ARIN | US | 7th Jun 2023 |