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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in United States
26,972 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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:b380::/32 | 4.3B × /64 | ARIN | US | 18th 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 |
| 2607:bc0::/32 | 4.3B × /64 | ARIN | US | 22nd Nov 2022 |
| 2607:bc80::/32 | 4.3B × /64 | ARIN | US | 26th Jun 2026 |
| 2607:be80::/32 | 4.3B × /64 | ARIN | US | 28th Oct 2016 |
| 2607:bec0::/32 | 4.3B × /64 | ARIN | US | 26th Jun 2024 |
| 2607:bf00::/32 | 4.3B × /64 | ARIN | US | 25th Jun 2012 |
| 2607:bfc0::/32 | 4.3B × /64 | ARIN | US | 27th Jun 2024 |
| 2607:c080::/32 | 4.3B × /64 | ARIN | US | 31st Oct 2016 |
| 2607:c0::/32 | 4.3B × /64 | ARIN | US | 19th Oct 2022 |
| 2607:c100::/32 | 4.3B × /64 | ARIN | US | 25th Jun 2012 |
| 2607:c140::/32 | 4.3B × /64 | ARIN | US | 1st Jul 2024 |
| 2607:c240::/32 | 4.3B × /64 | ARIN | US | 8th Jul 2024 |
| 2607:c380::/32 | 4.3B × /64 | ARIN | US | 7th Nov 2016 |
| 2607:c3c0::/36 | 268M × /64 | ARIN | US | 9th Jul 2024 |
| 2607:c440::/32 | 4.3B × /64 | ARIN | US | 11th Jul 2024 |
| 2607:c540::/32 | 4.3B × /64 | ARIN | US | 11th Jul 2024 |
| 2607:c580::/32 | 4.3B × /64 | ARIN | US | 8th Nov 2016 |
| 2607:c5c0::/32 | 4.3B × /64 | ARIN | US | 17th Jul 2024 |
| 2607:c600::/32 | 4.3B × /64 | ARIN | US | 15th Mar 2011 |
| 2607:c780::/32 | 4.3B × /64 | ARIN | US | 10th Nov 2016 |
| 2607:c7c0::/32 | 4.3B × /64 | ARIN | US | 22nd Jul 2024 |