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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
26,277 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 2607:9a80::/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: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 |
| 2607:a1c0::/32 | 4.3B × /64 | ARIN | US | 15th Mar 2024 |
| 2607:a200::/32 | 4.3B × /64 | ARIN | US | 8th Mar 2011 |
| 2607:a240::/32 | 4.3B × /64 | ARIN | US | 19th Mar 2024 |
| 2607:a40::/32 | 4.3B × /64 | ARIN | US | 18th Nov 2022 |
| 2607:a580::/32 | 4.3B × /64 | ARIN | US | 15th Sept 2016 |
| 2607:a5c0::/32 | 4.3B × /64 | ARIN | US | 2nd Apr 2024 |
| 2607:a600::/32 | 4.3B × /64 | ARIN | US | 8th Mar 2011 |
| 2607:a640::/32 | 4.3B × /64 | ARIN | US | 4th Apr 2024 |
| 2607:a6c0::/32 | 4.3B × /64 | ARIN | US | 5th Apr 2024 |
| 2607:a8c0::/32 | 4.3B × /64 | ARIN | US | 12th Apr 2024 |
| 2607:a900::/32 | 4.3B × /64 | ARIN | US | 15th Jun 2012 |
| 2607:a980::/32 | 4.3B × /64 | ARIN | US | 27th Sept 2016 |
| 2607:aa00::/32 | 4.3B × /64 | ARIN | US | 8th Mar 2011 |
| 2607:aa40::/32 | 4.3B × /64 | ARIN | US | 17th Apr 2024 |
| 2607:ab40::/32 | 4.3B × /64 | ARIN | US | 17th Apr 2024 |
| 2607:ac40::/32 | 4.3B × /64 | ARIN | US | 19th Apr 2024 |
| 2607:ae40::/32 | 4.3B × /64 | ARIN | US | 23rd Apr 2024 |
| 2607:af00::/32 | 4.3B × /64 | ARIN | US | 15th Jun 2012 |
| 2607:af80::/32 | 4.3B × /64 | ARIN | US | 7th Oct 2016 |
| 2607:b000::/32 | 4.3B × /64 | ARIN | US | 13th Apr 2010 |
| 2607:b080::/32 | 4.3B × /64 | ARIN | US | 7th Oct 2016 |
| 2607:b0c0::/32 | 4.3B × /64 | ARIN | US | 30th Apr 2024 |
| 2607:b1c0::/32 | 4.3B × /64 | ARIN | US | 2nd May 2024 |
| 2607:b200::/32 | 4.3B × /64 | ARIN | US | 9th Mar 2011 |
| 2607:b280::/32 | 4.3B × /64 | ARIN | US | 12th Oct 2016 |
| 2607:b540::/32 | 4.3B × /64 | ARIN | US | 14th May 2024 |
| 2607:b700::/32 | 4.3B × /64 | ARIN | US | 22nd Jun 2012 |
| 2607:b880::/32 | 4.3B × /64 | ARIN | US | 20th Oct 2016 |
| 2607:b8c0::/32 | 4.3B × /64 | ARIN | US | 4th Jun 2024 |
| 2607:ba00::/32 | 4.3B × /64 | ARIN | US | 9th Mar 2011 |
| 2607:ba40::/32 | 4.3B × /64 | ARIN | US | 6th Jun 2024 |
| 2607:bb00::/32 | 4.3B × /64 | ARIN | US | 25th Jun 2012 |