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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
27,001 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2607:2fc0::/32 | 4.3B × /64 | ARIN |  US | 27th Feb 2023 |
| 2607:3000::/32 | 4.3B × /64 | ARIN | US | 5th Apr 2010 |
| 2607:3040::/32 | 4.3B × /64 | ARIN | US | 1st Mar 2023 |
| 2607:3080::/32 | 4.3B × /64 | ARIN | US | 13th Apr 2016 |
| 2607:30c0::/32 | 4.3B × /64 | ARIN | US | 2nd Mar 2023 |
| 2607:3100::/32 | 4.3B × /64 | ARIN | US | 21st Mar 2012 |
| 2607:3140::/32 | 4.3B × /64 | ARIN | US | 2nd Mar 2023 |
| 2607:31c0::/32 | 4.3B × /64 | ARIN | US | 2nd Mar 2023 |
| 2607:32c0::/32 | 4.3B × /64 | ARIN | US | 7th Mar 2023 |
| 2607:3300::/32 | 4.3B × /64 | ARIN | US | 22nd Mar 2012 |
| 2607:3340::/32 | 4.3B × /64 | ARIN | US | 7th Mar 2023 |
| 2607:3480::/32 | 4.3B × /64 | ARIN | US | 20th Apr 2016 |
| 2607:34c0::/32 | 4.3B × /64 | ARIN | US | 10th Mar 2023 |
| 2607:3540::/32 | 4.3B × /64 | ARIN | US | 10th Mar 2023 |
| 2607:3580::/32 | 4.3B × /64 | ARIN | US | 22nd Apr 2016 |
| 2607:35c0::/32 | 4.3B × /64 | ARIN | US | 15th Mar 2023 |
| 2607:3680::/32 | 4.3B × /64 | ARIN | US | 22nd Apr 2016 |
| 2607:3780::/32 | 4.3B × /64 | ARIN | US | 25th Apr 2016 |
| 2607:37c0::/32 | 4.3B × /64 | ARIN | US | 27th Mar 2023 |
| 2607:3880::/32 | 4.3B × /64 | ARIN | US | 8th Jun 2026 |
| 2607:38c0::/32 | 4.3B × /64 | ARIN | US | 30th Mar 2023 |
| 2607:3900::/32 | 4.3B × /64 | ARIN | US | 23rd Mar 2012 |
| 2607:3980::/32 | 4.3B × /64 | ARIN | US | 25th Apr 2016 |
| 2607:3a00::/32 | 4.3B × /64 | ARIN | US | 24th Feb 2011 |
| 2607:3b00::/32 | 4.3B × /64 | ARIN | US | 27th Mar 2012 |
| 2607:3bc0::/32 | 4.3B × /64 | ARIN | US | 6th Apr 2023 |
| 2607:3c0::/32 | 4.3B × /64 | ARIN | US | 4th Nov 2022 |
| 2607:3c80::/32 | 4.3B × /64 | ARIN | US | 27th Apr 2016 |
| 2607:3d80::/32 | 4.3B × /64 | ARIN | US | 27th Apr 2016 |
| 2607:3e40::/32 | 4.3B × /64 | ARIN | US | 14th Apr 2023 |
| 2607:3e80::/32 | 4.3B × /64 | ARIN | US | 27th Apr 2016 |
| 2607:3ec0::/32 | 4.3B × /64 | ARIN | US | 14th Apr 2023 |
| 2607:3f80::/32 | 4.3B × /64 | ARIN | US | 29th Apr 2016 |
| 2607:40::/32 | 4.3B × /64 | ARIN | US | 14th Oct 2022 |
| 2607:40c0::/32 | 4.3B × /64 | ARIN | US | 20th Apr 2023 |
| 2607:4180::/32 | 4.3B × /64 | ARIN | US | 29th Apr 2016 |
| 2607:4340::/32 | 4.3B × /64 | ARIN | US | 1st May 2023 |
| 2607:4380::/32 | 4.3B × /64 | ARIN | US | 4th May 2016 |
| 2607:4400::/32 | 4.3B × /64 | ARIN | US | 1st Oct 2010 |
| 2607:4540::/32 | 4.3B × /64 | ARIN | US | 4th May 2023 |
| 2607:4680::/32 | 4.3B × /64 | ARIN | US | 9th May 2016 |
| 2607:4740::/32 | 4.3B × /64 | ARIN | US | 4th May 2023 |
| 2607:47c0::/32 | 4.3B × /64 | ARIN | US | 5th May 2023 |
| 2607:4840::/32 | 4.3B × /64 | ARIN | US | 5th May 2023 |
| 2607:4880::/32 | 4.3B × /64 | ARIN | US | 10th May 2016 |
| 2607:48c0::/32 | 4.3B × /64 | ARIN | US | 9th May 2023 |
| 2607:4900::/32 | 4.3B × /64 | ARIN | US | 4th Apr 2012 |
| 2607:4940::/32 | 4.3B × /64 | ARIN | US | 11th May 2023 |
| 2607:4ac0::/32 | 4.3B × /64 | ARIN | US | 15th May 2023 |
| 2607:4b40::/32 | 4.3B × /64 | ARIN | US | 15th May 2023 |