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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 2605:5380::/32 | 4.3B × /64 | ARIN |  US | 18th Jul 2019 |
| 2605:53c0::/32 | 4.3B × /64 | ARIN | US | 15th Jul 2019 |
| 2605:5400::/32 | 4.3B × /64 | ARIN | US | 4th Aug 2010 |
| 2605:540::/32 | 4.3B × /64 | ARIN | US | 25th Oct 2018 |
| 2605:5440::/32 | 4.3B × /64 | ARIN | US | 15th Jul 2019 |
| 2605:5540::/32 | 4.3B × /64 | ARIN | US | 17th Jul 2019 |
| 2605:55c0::/32 | 4.3B × /64 | ARIN | US | 17th Jul 2019 |
| 2605:5600::/32 | 4.3B × /64 | ARIN | US | 3rd Jan 2011 |
| 2605:5680::/32 | 4.3B × /64 | ARIN | US | 13th Mar 2014 |
| 2605:5700::/32 | 4.3B × /64 | ARIN | US | 29th Jun 2011 |
| 2605:5740::/36 | 268M × /64 | ARIN | US | 22nd Jul 2019 |
| 2605:5780::/32 | 4.3B × /64 | ARIN | US | 12th Mar 2026 |
| 2605:57c0::/32 | 4.3B × /64 | ARIN | US | 23rd Jul 2019 |
| 2605:5900::/32 | 4.3B × /64 | ARIN |  JM | 30th Jun 2011 |
| 2605:5a00::/32 | 4.3B × /64 | ARIN | US | 3rd Jan 2011 |
| 2605:5a40::/32 | 4.3B × /64 | ARIN | US | 29th Jul 2019 |
| 2605:5a80::/32 | 4.3B × /64 | ARIN | US | 20th Mar 2014 |
| 2605:5ac0::/32 | 4.3B × /64 | ARIN |  CA | 29th Jul 2019 |
| 2605:5b80::/32 | 4.3B × /64 | ARIN |  BM | 16th Mar 2026 |
| 2605:5bc0::/32 | 4.3B × /64 | ARIN | US | 30th Jul 2019 |
| 2605:5c00::/32 | 4.3B × /64 | ARIN | US | 4th Aug 2010 |
| 2605:5c40::/32 | 4.3B × /64 | ARIN | US | 30th Jul 2019 |
| 2605:5c80::/32 | 4.3B × /64 | ARIN | US | 16th Mar 2026 |
| 2605:5cc0::/32 | 4.3B × /64 | ARIN | US | 31st Jul 2019 |
| 2605:5d40::/32 | 4.3B × /64 | ARIN |  PR | 5th Aug 2019 |
| 2605:5d80::/32 | 4.3B × /64 | ARIN | US | 2nd Apr 2014 |
| 2605:5dc0::/32 | 4.3B × /64 | ARIN | US | 5th Aug 2019 |
| 2605:5e40::/32 | 4.3B × /64 | ARIN | US | 8th Aug 2019 |
| 2605:5ec0::/32 | 4.3B × /64 | ARIN | US | 8th Aug 2019 |
| 2605:5f00::/32 | 4.3B × /64 | ARIN | US | 1st Jul 2011 |
| 2605:5f40::/32 | 4.3B × /64 | ARIN | CA | 13th Aug 2019 |
| 2605:600::/32 | 4.3B × /64 | ARIN | US | 7th Dec 2010 |
| 2605:6040::/32 | 4.3B × /64 | ARIN | US | 20th Aug 2019 |
| 2605:6100::/32 | 4.3B × /64 | ARIN | US | 1st Jul 2011 |
| 2605:6240::/32 | 4.3B × /64 | ARIN | US | 27th Aug 2019 |
| 2605:6380::/32 | 4.3B × /64 | ARIN | US | 24th Apr 2014 |
| 2605:63c0::/32 | 4.3B × /64 | ARIN | US | 3rd Sept 2019 |
| 2605:640::/32 | 4.3B × /64 | ARIN | US | 31st Oct 2018 |
| 2605:6540::/32 | 4.3B × /64 | ARIN | US | 10th Sept 2019 |
| 2605:6580::/32 | 4.3B × /64 | ARIN | US | 25th Apr 2014 |
| 2605:6680::/32 | 4.3B × /64 | ARIN | US | 5th May 2014 |
| 2605:6700::/32 | 4.3B × /64 | ARIN | US | 11th Jul 2011 |
| 2605:6780::/32 | 4.3B × /64 | ARIN | US | 6th May 2014 |
| 2605:67c0::/32 | 4.3B × /64 | ARIN | US | 20th Sept 2019 |
| 2605:680::/32 | 4.3B × /64 | ARIN | US | 24th Sept 2013 |
| 2605:68c0::/32 | 4.3B × /64 | ARIN | US | 20th Sept 2019 |
| 2605:6940::/32 | 4.3B × /64 | ARIN | US | 20th Sept 2019 |
| 2605:69c0::/32 | 4.3B × /64 | ARIN | US | 24th Sept 2019 |
| 2605:6a00::/32 | 4.3B × /64 | ARIN | CA | 4th Jan 2011 |
| 2605:6a80::/32 | 4.3B × /64 | ARIN | US | 12th May 2014 |