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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,459 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 2607:4280::/32 | 4.3B × /64 | ARIN | US | 2nd May 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 |
| 2607:45c0::/32 | 4.3B × /64 | ARIN |  CA | 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 |
| 2607:4ac0::/32 | 4.3B × /64 | ARIN | US | 15th May 2023 |
| 2607:4b40::/32 | 4.3B × /64 | ARIN | US | 15th May 2023 |
| 2607:4c00::/32 | 4.3B × /64 | ARIN | CA | 4th Oct 2010 |
| 2607:4c40::/32 | 4.3B × /64 | ARIN | US | 17th May 2023 |
| 2607:4ca0::/32 | 4.3B × /64 | ARIN | US | 22nd Jul 2026 |
| 2607:4d80::/32 | 4.3B × /64 | ARIN | US | 11th May 2016 |
| 2607:4e40::/32 | 4.3B × /64 | ARIN | US | 22nd May 2023 |
| 2607:4ec0::/32 | 4.3B × /64 | ARIN | US | 23rd May 2023 |
| 2607:4fc0::/32 | 4.3B × /64 | ARIN | US | 31st May 2023 |
| 2607:5000::/30 | 17.2B × /64 | ARIN | US | 12th Apr 2010 |
| 2607:5004::/31 | 8.6B × /64 | ARIN | US | 12th Apr 2010 |
| 2607:5006::/32 | 4.3B × /64 | ARIN | US | 12th Apr 2010 |
| 2607:5080::/32 | 4.3B × /64 | ARIN | US | 19th May 2016 |
| 2607:5140::/32 | 4.3B × /64 | ARIN | US | 5th Jun 2023 |
| 2607:51c0::/32 | 4.3B × /64 | ARIN | US | 7th Jun 2023 |
| 2607:5280::/32 | 4.3B × /64 | ARIN | US | 27th May 2016 |
| 2607:5340::/32 | 4.3B × /64 | ARIN | CA | 13th Jun 2023 |
| 2607:5400::/32 | 4.3B × /64 | ARIN | US | 4th Oct 2010 |
| 2607:540::/32 | 4.3B × /64 | ARIN | US | 9th Nov 2022 |
| 2607:55c0::/32 | 4.3B × /64 | ARIN | US | 28th Jun 2023 |
| 2607:5680::/32 | 4.3B × /64 | ARIN | US | 2nd Jun 2016 |
| 2607:5700::/32 | 4.3B × /64 | ARIN | US | 20th Apr 2012 |
| 2607:5740::/32 | 4.3B × /64 | ARIN | US | 7th Jul 2023 |
| 2607:57c0::/32 | 4.3B × /64 | ARIN | US | 7th Jul 2023 |
| 2607:58c0::/32 | 4.3B × /64 | ARIN | US | 12th Jul 2023 |
| 2607:5900::/32 | 4.3B × /64 | ARIN | CA | 9th Jun 2026 |
| 2607:59c0::/32 | 4.3B × /64 | ARIN | US | 13th Jul 2023 |
| 2607:5a00::/32 | 4.3B × /64 | ARIN | US | 1st Mar 2011 |
| 2607:5a40::/32 | 4.3B × /64 | ARIN | US | 14th Jul 2023 |
| 2607:5b00::/32 | 4.3B × /64 | ARIN | US | 23rd Jan 2014 |