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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,248 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2607:d100::/32 | 4.3B × /64 | ARIN |  US | 27th Nov 2012 |
| 2607:d140::/32 | 4.3B × /64 | ARIN | US | 30th Aug 2024 |
| 2607:d180::/32 | 4.3B × /64 | ARIN | US | 18th Nov 2016 |
| 2607:d200::/32 | 4.3B × /64 | ARIN | US | 15th Mar 2011 |
| 2607:d280::/32 | 4.3B × /64 | ARIN | US | 21st Nov 2016 |
| 2607:d2c0::/32 | 4.3B × /64 | ARIN | US | 4th Sept 2024 |
| 2607:d340::/32 | 4.3B × /64 | ARIN | US | 4th Sept 2024 |
| 2607:d380::/32 | 4.3B × /64 | ARIN |  CA | 22nd Nov 2016 |
| 2607:d480::/32 | 4.3B × /64 | ARIN | US | 22nd Nov 2016 |
| 2607:d680::/32 | 4.3B × /64 | ARIN | US | 23rd Nov 2016 |
| 2607:d6c0::/32 | 4.3B × /64 | ARIN | US | 20th Sept 2024 |
| 2607:d700::/32 | 4.3B × /64 | ARIN | CA | 17th Jul 2012 |
| 2607:d780::/32 | 4.3B × /64 | ARIN | US | 28th Nov 2016 |
| 2607:d880::/32 | 4.3B × /64 | ARIN | CA | 30th Nov 2016 |
| 2607:d8c0::/32 | 4.3B × /64 | ARIN | US | 1st Oct 2024 |
| 2607:d900::/32 | 4.3B × /64 | ARIN | US | 19th Jul 2012 |
| 2607:d940::/32 | 4.3B × /64 | ARIN | US | 4th Oct 2024 |
| 2607:d9c0::/32 | 4.3B × /64 | ARIN | US | 4th Oct 2024 |
| 2607:da40::/32 | 4.3B × /64 | ARIN | US | 9th Oct 2024 |
| 2607:dac0::/32 | 4.3B × /64 | ARIN | US | 10th Oct 2024 |
| 2607:dc00::/32 | 4.3B × /64 | ARIN | US | 19th Oct 2010 |
| 2607:dcc0::/36 | 268M × /64 | ARIN | US | 17th Oct 2024 |
| 2607:dd00::/32 | 4.3B × /64 | ARIN | US | 23rd Jul 2012 |
| 2607:de00::/32 | 4.3B × /64 | ARIN | CA | 15th Mar 2011 |
| 2607:de40::/32 | 4.3B × /64 | ARIN | US | 24th Oct 2024 |
| 2607:de80::/32 | 4.3B × /64 | ARIN |  CZ | 2nd Dec 2016 |
| 2607:df00::/32 | 4.3B × /64 | ARIN | US | 23rd Jul 2012 |
| 2607:df40::/32 | 4.3B × /64 | ARIN | US | 30th Oct 2024 |
| 2607:e040::/32 | 4.3B × /64 | ARIN | US | 4th Nov 2024 |
| 2607:e140::/32 | 4.3B × /64 | ARIN | CA | 5th Nov 2024 |
| 2607:e200::/32 | 4.3B × /64 | ARIN | US | 16th Mar 2011 |
| 2607:e240::/40 | 16.8M × /64 | ARIN | CA | 15th Nov 2024 |
| 2607:e340::/32 | 4.3B × /64 | ARIN | CA | 25th Nov 2024 |
| 2607:e40::/32 | 4.3B × /64 | ARIN | US | 1st Dec 2022 |
| 2607:e440::/36 | 268M × /64 | ARIN | US | 2nd Dec 2024 |
| 2607:e500::/32 | 4.3B × /64 | ARIN | US | 26th Jul 2012 |
| 2607:e540::/32 | 4.3B × /64 | ARIN | US | 3rd Dec 2024 |
| 2607:e680::/32 | 4.3B × /64 | ARIN | US | 7th Dec 2016 |
| 2607:e6c0::/32 | 4.3B × /64 | ARIN | US | 10th Dec 2024 |
| 2607:e800::/32 | 4.3B × /64 | ARIN | US | 14th Jun 2010 |
| 2607:e8c0::/32 | 4.3B × /64 | ARIN | US | 17th Dec 2024 |
| 2607:e900::/32 | 4.3B × /64 | ARIN | US | 30th Jul 2012 |
| 2607:e9c0::/32 | 4.3B × /64 | ARIN | US | 26th Dec 2024 |
| 2607:ea40::/32 | 4.3B × /64 | ARIN | US | 27th Dec 2024 |
| 2607:ea80::/32 | 4.3B × /64 | ARIN | CA | 12th Dec 2016 |
| 2607:ebc0::/32 | 4.3B × /64 | ARIN | US | 31st Dec 2024 |
| 2607:ec00::/32 | 4.3B × /64 | ARIN | US | 19th Oct 2010 |
| 2607:ec40::/32 | 4.3B × /64 | ARIN | US | 6th Jan 2025 |
| 2607:ecc0::/32 | 4.3B × /64 | ARIN | US | 7th Jan 2025 |
| 2607:ed00::/32 | 4.3B × /64 | ARIN | CA | 2nd Aug 2012 |