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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
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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 |
|---|---|---|---|---|
| 2602:81c:6000::/44 | 1M × /64 | ARIN |  US | 2nd Oct 2025 |
| 2602:81c:7000::/40 | 16.8M × /64 | ARIN | US | 3rd Oct 2025 |
| 2602:81c:9000::/44 | 1M × /64 | ARIN | US | 6th Oct 2025 |
| 2602:81c::/44 | 1M × /64 | ARIN | US | 21st Jul 2025 |
| 2602:81c:c000::/40 | 16.8M × /64 | ARIN | US | 19th Nov 2025 |
| 2602:81c:d000::/40 | 16.8M × /64 | ARIN | US | 24th Nov 2025 |
| 2602:81d:2000::/40 | 16.8M × /64 | ARIN | US | 10th Mar 2026 |
| 2602:81d:6000::/44 | 1M × /64 | ARIN | US | 25th Mar 2026 |
| 2602:81d:8000::/40 | 16.8M × /64 | ARIN | US | 3rd Apr 2026 |
| 2602:81d:9000::/40 | 16.8M × /64 | ARIN | US | 27th Apr 2026 |
| 2602:81d:a000::/44 | 1M × /64 | ARIN | US | 28th Apr 2026 |
| 2602:81d:c000::/40 | 16.8M × /64 | ARIN | US | 8th May 2026 |
| 2602:81d:d000::/44 | 1M × /64 | ARIN | US | 12th May 2026 |
| 2602:81d:f000::/44 | 1M × /64 | ARIN | US | 4th Jun 2026 |
| 2602:81e:2000::/44 | 1M × /64 | ARIN | US | 15th Jun 2026 |
| 2602:81e:4000::/44 | 1M × /64 | ARIN | US | 1st Jul 2026 |
| 2602:81e:6000::/44 | 1M × /64 | ARIN | US | 20th Jul 2026 |
| 2602:81e:7000::/44 | 1M × /64 | ARIN | US | 27th Jul 2026 |
| 2602:81e:8000::/44 | 1M × /64 | ARIN | US | 6th Aug 2026 |
| 2602:81e::/44 | 1M × /64 | ARIN | US | 11th Jun 2026 |
| 2602:81e:a000::/44 | 1M × /64 | ARIN | US | 12th Aug 2026 |
| 2602:f308::/40 | 16.8M × /64 | ARIN | US | 25th Aug 2026 |
| 2602:f309::/36 | 268M × /64 | ARIN | US | 24th Aug 2026 |
| 2602:f30a::/40 | 16.8M × /64 | ARIN | US | 24th Aug 2026 |
| 2602:f30b::/40 | 16.8M × /64 | ARIN | US | 24th Aug 2026 |
| 2602:f30c::/36 | 268M × /64 | ARIN | US | 24th Aug 2026 |
| 2602:f30d::/40 | 16.8M × /64 | ARIN | US | 24th Aug 2026 |
| 2602:f30e::/40 | 16.8M × /64 | ARIN | US | 24th Aug 2026 |
| 2602:f310::/40 | 16.8M × /64 | ARIN | US | 20th Aug 2026 |
| 2602:f312::/40 | 16.8M × /64 | ARIN | US | 20th Aug 2026 |
| 2602:f313::/40 | 16.8M × /64 | ARIN | US | 20th Aug 2026 |
| 2602:f316::/40 | 16.8M × /64 | ARIN | US | 19th Aug 2026 |
| 2602:f317::/40 | 16.8M × /64 | ARIN | US | 19th Aug 2026 |
| 2602:f318::/40 | 16.8M × /64 | ARIN | US | 19th Aug 2026 |
| 2602:f319::/36 | 268M × /64 | ARIN | US | 18th Aug 2026 |
| 2602:f31a::/40 | 16.8M × /64 | ARIN | US | 18th Aug 2026 |
| 2602:f31d::/40 | 16.8M × /64 | ARIN | US | 13th Aug 2026 |
| 2602:f31e::/40 | 16.8M × /64 | ARIN | US | 13th Aug 2026 |
| 2602:f31f::/36 | 268M × /64 | ARIN | US | 12th Aug 2026 |
| 2602:f320::/36 | 268M × /64 | ARIN | US | 12th Aug 2026 |
| 2602:f321::/36 | 268M × /64 | ARIN | US | 12th Aug 2026 |
| 2602:f322::/40 | 16.8M × /64 | ARIN | US | 11th Aug 2026 |
| 2602:f323::/40 | 16.8M × /64 | ARIN | US | 11th Aug 2026 |
| 2602:f324::/40 | 16.8M × /64 | ARIN | US | 11th Aug 2026 |
| 2602:f326::/36 | 268M × /64 | ARIN | US | 7th Aug 2026 |
| 2602:f329::/40 | 16.8M × /64 | ARIN | US | 6th Aug 2026 |
| 2602:f32b::/40 | 16.8M × /64 | ARIN | US | 6th Aug 2026 |
| 2602:f32c::/40 | 16.8M × /64 | ARIN | US | 5th Aug 2026 |
| 2602:f32d::/40 | 16.8M × /64 | ARIN | US | 3rd Aug 2026 |
| 2602:f32e::/40 | 16.8M × /64 | ARIN | US | 3rd Aug 2026 |