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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,279 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2607:1500::/32 | 4.3B × /64 | ARIN |  US | 2nd Mar 2012 |
| 2607:1540::/32 | 4.3B × /64 | ARIN | US | 4th Jun 2026 |
| 2607:1600::/32 | 4.3B × /64 | ARIN | US | 22nd Feb 2011 |
| 2607:16c0::/32 | 4.3B × /64 | ARIN | US | 22nd Dec 2022 |
| 2607:1780::/32 | 4.3B × /64 | ARIN | US | 16th Mar 2016 |
| 2607:17c0::/32 | 4.3B × /64 | ARIN | US | 22nd Dec 2022 |
| 2607:1840::/32 | 4.3B × /64 | ARIN | US | 22nd Dec 2022 |
| 2607:18c0::/32 | 4.3B × /64 | ARIN |  BM | 22nd Dec 2022 |
| 2607:1980::/32 | 4.3B × /64 | ARIN | US | 16th Mar 2016 |
| 2607:1a80::/32 | 4.3B × /64 | ARIN | US | 17th Mar 2016 |
| 2607:1b80::/32 | 4.3B × /64 | ARIN | US | 18th Mar 2016 |
| 2607:1bc0::/32 | 4.3B × /64 | ARIN | US | 10th Jan 2023 |
| 2607:1c40::/32 | 4.3B × /64 | ARIN | US | 11th Jan 2023 |
| 2607:1dc0::/32 | 4.3B × /64 | ARIN | US | 11th Jan 2023 |
| 2607:1ec0::/32 | 4.3B × /64 | ARIN | US | 13th Jan 2023 |
| 2607:1f80::/32 | 4.3B × /64 | ARIN | US | 25th Mar 2016 |
| 2607:200::/32 | 4.3B × /64 | ARIN | US | 18th Feb 2011 |
| 2607:2140::/32 | 4.3B × /64 | ARIN | US | 20th Jan 2023 |
| 2607:21c0::/32 | 4.3B × /64 | ARIN | US | 25th Jan 2023 |
| 2607:2200::/32 | 4.3B × /64 | ARIN | US | 23rd Feb 2011 |
| 2607:22c0::/32 | 4.3B × /64 | ARIN | US | 27th Jan 2023 |
| 2607:2300::/32 | 4.3B × /64 | ARIN | US | 14th Mar 2012 |
| 2607:2440::/32 | 4.3B × /64 | ARIN | US | 2nd Feb 2023 |
| 2607:2480::/32 | 4.3B × /64 | ARIN | US | 28th Mar 2016 |
| 2607:25c0::/32 | 4.3B × /64 | ARIN | US | 3rd Feb 2023 |
| 2607:26c0::/32 | 4.3B × /64 | ARIN | US | 6th Feb 2023 |
| 2607:27c0::/32 | 4.3B × /64 | ARIN | US | 9th Feb 2023 |
| 2607:2840::/32 | 4.3B × /64 | ARIN | US | 9th Feb 2023 |
| 2607:2880::/32 | 4.3B × /64 | ARIN |  CA | 5th Apr 2016 |
| 2607:28c0::/32 | 4.3B × /64 | ARIN | US | 10th Feb 2023 |
| 2607:2940::/32 | 4.3B × /64 | ARIN | US | 10th Feb 2023 |
| 2607:2980::/32 | 4.3B × /64 | ARIN | US | 5th Apr 2016 |
| 2607:2b00::/32 | 4.3B × /64 | ARIN | US | 16th Mar 2012 |
| 2607:2c80::/32 | 4.3B × /64 | ARIN | US | 5th Jun 2026 |
| 2607:2d00::/32 | 4.3B × /64 | ARIN | CA | 19th Mar 2012 |
| 2607:2d80::/32 | 4.3B × /64 | ARIN | US | 7th Apr 2016 |
| 2607:2dc0::/32 | 4.3B × /64 | ARIN | US | 22nd Feb 2023 |
| 2607:2f40::/32 | 4.3B × /64 | ARIN | US | 27th Feb 2023 |
| 2607:2fc0::/32 | 4.3B × /64 | ARIN | US | 27th Feb 2023 |
| 2607:3000::/32 | 4.3B × /64 | ARIN | US | 5th Apr 2010 |
| 2607:300::/32 | 4.3B × /64 | ARIN |  BS | 22nd Feb 2012 |
| 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 |