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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 2605:43c0::/32 | 4.3B × /64 | ARIN |  US | 13th May 2019 |
| 2605:440::/32 | 4.3B × /64 | ARIN | US | 24th Oct 2018 |
| 2605:4440::/32 | 4.3B × /64 | ARIN | US | 13th May 2019 |
| 2605:4540::/32 | 4.3B × /64 | ARIN | US | 14th May 2019 |
| 2605:4580::/32 | 4.3B × /64 | ARIN | US | 18th Feb 2014 |
| 2605:4600::/32 | 4.3B × /64 | ARIN | US | 28th Dec 2010 |
| 2605:4640::/32 | 4.3B × /64 | ARIN | US | 20th May 2019 |
| 2605:4700::/32 | 4.3B × /64 | ARIN |  PR | 21st Apr 2014 |
| 2605:4740::/32 | 4.3B × /64 | ARIN | US | 23rd May 2019 |
| 2605:4780::/32 | 4.3B × /64 | ARIN | US | 20th Feb 2014 |
| 2605:4800::/32 | 4.3B × /64 | ARIN | US | 3rd May 2010 |
| 2605:4bc0::/32 | 4.3B × /64 | ARIN | US | 31st May 2019 |
| 2605:4c00::/32 | 4.3B × /64 | ARIN | US | 11th Mar 2026 |
| 2605:4c80::/32 | 4.3B × /64 | ARIN | US | 26th Feb 2014 |
| 2605:4d00::/32 | 4.3B × /64 | ARIN | US | 23rd Jun 2011 |
| 2605:4dc0::/36 | 268M × /64 | ARIN | US | 11th Jun 2019 |
| 2605:4e00::/32 | 4.3B × /64 | ARIN | US | 28th Dec 2010 |
| 2605:4ec0::/32 | 4.3B × /64 | ARIN | US | 25th Jun 2019 |
| 2605:4f40::/32 | 4.3B × /64 | ARIN | US | 25th Jun 2019 |
| 2605:4f80::/32 | 4.3B × /64 | ARIN | US | 4th Mar 2014 |
| 2605:4fc0::/32 | 4.3B × /64 | ARIN |  CA | 28th Jun 2019 |
| 2605:50c0::/32 | 4.3B × /64 | ARIN | US | 1st Jul 2019 |
| 2605:5100::/32 | 4.3B × /64 | ARIN | US | 24th Jun 2011 |
| 2605:5140::/32 | 4.3B × /64 | ARIN | US | 3rd Jul 2019 |
| 2605:5180::/32 | 4.3B × /64 | ARIN | US | 10th Mar 2014 |
| 2605:51c0::/32 | 4.3B × /64 | ARIN | US | 3rd Jul 2019 |
| 2605:5240::/32 | 4.3B × /64 | ARIN | US | 11th Jul 2019 |
| 2605:5280::/32 | 4.3B × /64 | ARIN | US | 11th Mar 2014 |
| 2605:5340::/32 | 4.3B × /64 | ARIN | US | 15th Jul 2019 |
| 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 |
| 2605:5900::/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 |
| 2605:5ac0::/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 |