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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 2605:2440::/32 | 4.3B × /64 | ARIN |  US | 27th Feb 2019 |
| 2605:2580::/32 | 4.3B × /64 | ARIN | US | 25th Nov 2013 |
| 2605:25c0::/32 | 4.3B × /64 | ARIN | US | 1st Mar 2019 |
| 2605:2740::/32 | 4.3B × /64 | ARIN | US | 5th Mar 2019 |
| 2605:2780::/32 | 4.3B × /64 | ARIN | US | 25th Feb 2026 |
| 2605:28c0::/32 | 4.3B × /64 | ARIN | US | 12th Mar 2019 |
| 2605:2900::/32 | 4.3B × /64 | ARIN |  CA | 10th Jun 2011 |
| 2605:2980::/32 | 4.3B × /64 | ARIN | US | 3rd Dec 2013 |
| 2605:29c0::/32 | 4.3B × /64 | ARIN | US | 12th Mar 2019 |
| 2605:2b00::/32 | 4.3B × /64 | ARIN | US | 13th Jun 2011 |
| 2605:2c00::/32 | 4.3B × /64 | ARIN | US | 27th Jul 2010 |
| 2605:2c80::/32 | 4.3B × /64 | ARIN | US | 6th Dec 2013 |
| 2605:2d40::/32 | 4.3B × /64 | ARIN | US | 18th Mar 2019 |
| 2605:2dc0::/32 | 4.3B × /64 | ARIN | CA | 20th Mar 2019 |
| 2605:2e00::/36 | 268M × /64 | ARIN |  IT | 15th Aug 2014 |
| 2605:2ec0::/32 | 4.3B × /64 | ARIN | US | 22nd Mar 2019 |
| 2605:2f00::/32 | 4.3B × /64 | ARIN | US | 13th Jun 2011 |
| 2605:2f40::/32 | 4.3B × /64 | ARIN | US | 25th Mar 2019 |
| 2605:2f80::/32 | 4.3B × /64 | ARIN | US | 27th Feb 2026 |
| 2605:2fc0::/32 | 4.3B × /64 | ARIN | US | 27th Mar 2019 |
| 2605:3080::/32 | 4.3B × /64 | ARIN | US | 19th Dec 2013 |
| 2605:30c0::/32 | 4.3B × /64 | ARIN | US | 29th Mar 2019 |
| 2605:3140::/32 | 4.3B × /64 | ARIN | US | 6th Mar 2026 |
| 2605:3200::/32 | 4.3B × /64 | ARIN | US | 20th Dec 2010 |
| 2605:3280::/32 | 4.3B × /64 | ARIN | US | 27th Dec 2013 |
| 2605:32c0::/32 | 4.3B × /64 | ARIN | US | 5th Apr 2019 |
| 2605:3300::/32 | 4.3B × /64 | ARIN | US | 14th Jun 2011 |
| 2605:3440::/32 | 4.3B × /64 | ARIN | US | 10th Apr 2019 |
| 2605:3500::/32 | 4.3B × /64 | ARIN | US | 14th Jun 2011 |
| 2605:3540::/32 | 4.3B × /64 | ARIN | US | 11th Apr 2019 |
| 2605:3580::/32 | 4.3B × /64 | ARIN | US | 9th Jan 2014 |
| 2605:3600::/32 | 4.3B × /64 | ARIN | US | 21st Dec 2010 |
| 2605:3680::/32 | 4.3B × /64 | ARIN | US | 9th Jan 2014 |
| 2605:3740::/36 | 268M × /64 | ARIN | CA | 15th Apr 2019 |
| 2605:37c0::/32 | 4.3B × /64 | ARIN | US | 15th Apr 2019 |
| 2605:3840::/32 | 4.3B × /64 | ARIN | US | 15th Apr 2019 |
| 2605:3900::/32 | 4.3B × /64 | ARIN | US | 15th Jun 2011 |
| 2605:39c0::/32 | 4.3B × /64 | ARIN | US | 18th Apr 2019 |
| 2605:3c00::/32 | 4.3B × /64 | ARIN | US | 30th Jul 2010 |
| 2605:3d40::/32 | 4.3B × /64 | ARIN | CA | 29th Apr 2019 |
| 2605:3ec0::/32 | 4.3B × /64 | ARIN | US | 1st May 2019 |
| 2605:3f00::/32 | 4.3B × /64 | ARIN | CA | 16th Jun 2011 |
| 2605:3fc0::/32 | 4.3B × /64 | ARIN | US | 6th Mar 2026 |
| 2605:400::/32 | 4.3B × /64 | ARIN | US | 20th Jul 2010 |
| 2605:40::/32 | 4.3B × /64 | ARIN | US | 10th Oct 2018 |
| 2605:4100::/32 | 4.3B × /64 | ARIN | US | 16th Jun 2011 |
| 2605:4140::/32 | 4.3B × /64 | ARIN | US | 6th May 2019 |
| 2605:41c0::/32 | 4.3B × /64 | ARIN | US | 6th May 2019 |
| 2605:4280::/32 | 4.3B × /64 | ARIN | US | 12th Feb 2014 |
| 2605:42c0::/32 | 4.3B × /64 | ARIN | US | 9th May 2019 |