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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,279 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2607:880::/32 | 4.3B × /64 | ARIN |  US | 29th Feb 2016 |
| 2607:8880::/32 | 4.3B × /64 | ARIN |  CA | 17th Aug 2016 |
| 2607:8980::/36 | 268M × /64 | ARIN | US | 17th Aug 2016 |
| 2607:89c0::/32 | 4.3B × /64 | ARIN | US | 8th Jan 2024 |
| 2607:8a80::/32 | 4.3B × /64 | ARIN |  PR | 18th Aug 2016 |
| 2607:8b40::/32 | 4.3B × /64 | ARIN | CA | 16th Jan 2024 |
| 2607:8c00::/32 | 4.3B × /64 | ARIN | US | 11th Oct 2010 |
| 2607:8c0::/28 | 68.7B × /64 | ARIN | US | 16th Nov 2022 |
| 2607:8d00::/32 | 4.3B × /64 | ARIN | US | 31st May 2012 |
| 2607:8d80::/32 | 4.3B × /64 | ARIN | US | 24th Aug 2016 |
| 2607:8e80::/32 | 4.3B × /64 | ARIN | CA | 24th Aug 2016 |
| 2607:8f00::/32 | 4.3B × /64 | ARIN | US | 4th Jun 2012 |
| 2607:8f40::/32 | 4.3B × /64 | ARIN | US | 26th Jan 2024 |
| 2607:8fc0::/32 | 4.3B × /64 | ARIN | US | 26th Jan 2024 |
| 2607:900::/32 | 4.3B × /64 | ARIN | US | 27th Feb 2012 |
| 2607:9040::/32 | 4.3B × /64 | ARIN | US | 30th Jan 2024 |
| 2607:9180::/32 | 4.3B × /64 | ARIN | US | 15th Jun 2026 |
| 2607:9300::/32 | 4.3B × /64 | ARIN | US | 15th Jun 2026 |
| 2607:9340::/32 | 4.3B × /64 | ARIN | US | 5th Feb 2024 |
| 2607:9380::/32 | 4.3B × /64 | ARIN | US | 31st Aug 2016 |
| 2607:93c0::/32 | 4.3B × /64 | ARIN | US | 5th Feb 2024 |
| 2607:940::/32 | 4.3B × /64 | ARIN | US | 16th Nov 2022 |
| 2607:94c0::/32 | 4.3B × /64 | ARIN | US | 8th Feb 2024 |
| 2607:9500::/32 | 4.3B × /64 | ARIN | CA | 5th Jun 2012 |
| 2607:9580::/32 | 4.3B × /64 | ARIN | US | 1st Sept 2016 |
| 2607:95c0::/32 | 4.3B × /64 | ARIN | US | 9th Feb 2024 |
| 2607:9680::/32 | 4.3B × /64 | ARIN | US | 1st Sept 2016 |
| 2607:9700::/32 | 4.3B × /64 | ARIN | US | 6th Jun 2012 |
| 2607:9780::/32 | 4.3B × /64 | ARIN | US | 22nd Jun 2026 |
| 2607:97c0::/32 | 4.3B × /64 | ARIN | US | 13th Feb 2024 |
| 2607:980::/32 | 4.3B × /64 | ARIN | US | 29th Feb 2016 |
| 2607:98c0::/32 | 4.3B × /64 | ARIN | US | 21st Feb 2024 |
| 2607:9900::/32 | 4.3B × /64 | ARIN | US | 23rd Jun 2026 |
| 2607:9980::/32 | 4.3B × /64 | ARIN | CA | 2nd Sept 2016 |
| 2607:9a40::/32 | 4.3B × /64 | ARIN | CA | 23rd Feb 2024 |
| 2607:9a80::/32 | 4.3B × /64 | ARIN | US | 2nd Sept 2016 |
| 2607:9c40::/32 | 4.3B × /64 | ARIN | US | 4th Mar 2024 |
| 2607:9c80::/32 | 4.3B × /64 | ARIN | US | 2nd Sept 2016 |
| 2607:9cc0::/32 | 4.3B × /64 | ARIN | US | 4th Mar 2024 |
| 2607:9d40::/32 | 4.3B × /64 | ARIN | US | 5th Mar 2024 |
| 2607:9dc0::/32 | 4.3B × /64 | ARIN | US | 6th Mar 2024 |
| 2607:9ec0::/40 | 16.8M × /64 | ARIN | US | 6th Mar 2024 |
| 2607:9f80::/32 | 4.3B × /64 | ARIN | US | 9th Sept 2016 |
| 2607:9fc0::/32 | 4.3B × /64 | ARIN | US | 12th Mar 2024 |
| 2607:a00::/32 | 4.3B × /64 | ARIN | CA | 22nd Feb 2011 |
| 2607:a040::/32 | 4.3B × /64 | ARIN | US | 14th Mar 2024 |
| 2607:a080::/32 | 4.3B × /64 | ARIN | US | 9th Sept 2016 |
| 2607:a100::/32 | 4.3B × /64 | ARIN | US | 24th Jun 2026 |
| 2607:a140::/32 | 4.3B × /64 | ARIN | US | 14th Mar 2024 |
| 2607:a180::/32 | 4.3B × /64 | ARIN | US | 9th Sept 2016 |