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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 the most unannounced blocks, largest first.
Unannounced blocks
84,424 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2602:81a:e000::/44 | 1M × /64 | ARIN |  US | 3rd Dec 2024 |
| 2602:81a:f000::/44 | 1M × /64 | ARIN | US | 7th Feb 2025 |
| 2602:81b:1000::/44 | 1M × /64 | ARIN | US | 13th Feb 2025 |
| 2602:81b:2000::/44 | 1M × /64 | ARIN | US | 18th Feb 2025 |
| 2602:81b:4000::/44 | 1M × /64 | ARIN | US | 13th Mar 2025 |
| 2602:81b:8000::/44 | 1M × /64 | ARIN | US | 5th May 2025 |
| 2602:81b::/40 | 16.8M × /64 | ARIN | US | 12th Feb 2025 |
| 2602:81b:a000::/44 | 1M × /64 | ARIN | US | 19th May 2025 |
| 2602:81b:c000::/44 | 1M × /64 | ARIN | US | 3rd Jun 2025 |
| 2602:81b:d000::/40 | 16.8M × /64 | ARIN | US | 23rd Jun 2025 |
| 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:1000::/40 | 16.8M × /64 | ARIN |  CA | 15th Jan 2026 |
| 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:1000::/44 | 1M × /64 | ARIN | CA | 12th 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:7000::/44 | 1M × /64 | ARIN | US | 27th Jul 2026 |
| 2602:81e:8000::/44 | 1M × /64 | ARIN | US | 6th Aug 2026 |
| 2602:81e:b000::/44 | 1M × /64 | ARIN | US | 15th Sept 2026 |
| 2602:81e:d000::/44 | 1M × /64 | ARIN | US | 25th Sept 2026 |
| 2602:81e:f000::/44 | 1M × /64 | ARIN | US | 2nd Oct 2026 |
| 2602:81f:2000::/44 | 1M × /64 | ARIN | US | 8th Oct 2026 |
| 2602:81f:5000::/44 | 1M × /64 | ARIN | US | 16th Oct 2026 |
| 2602:81f:7000::/44 | 1M × /64 | ARIN | US | 23rd Oct 2026 |
| 2602:81f:9000::/40 | 16.8M × /64 | ARIN | US | 28th Oct 2026 |
| 2602:81f::/44 | 1M × /64 | ARIN | US | 2nd Oct 2026 |
| 2602:81f:a000::/44 | 1M × /64 | ARIN | US | 28th Oct 2026 |
| 2602:81f:b000::/44 | 1M × /64 | ARIN | US | 28th Oct 2026 |
| 2602:81f:d000::/44 | 1M × /64 | ARIN | US | 2nd Nov 2026 |
| 2602:81f:e000::/44 | 1M × /64 | ARIN | US | 3rd Nov 2026 |
| 2602:f25c::/36 | 268M × /64 | ARIN | US | 13th Nov 2026 |
| 2602:f25d::/40 | 16.8M × /64 | ARIN | CA | 13th Nov 2026 |
| 2602:f25e::/36 | 268M × /64 | ARIN | US | 13th Nov 2026 |
| 2602:f25f::/40 | 16.8M × /64 | ARIN | US | 13th Nov 2026 |
| 2602:f260::/36 | 268M × /64 | ARIN | CA | 13th Nov 2026 |
| 2602:f261::/40 | 16.8M × /64 | ARIN | US | 10th Nov 2026 |
| 2602:f262::/40 | 16.8M × /64 | ARIN | US | 10th Nov 2026 |
| 2602:f264::/40 | 16.8M × /64 | ARIN | US | 9th Nov 2026 |