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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
Browse by registry
Browse by country
Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,279 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 2605:3680::/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 |
| 2605:3900::/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 |
| 2605:3e40::/28 | 68.7B × /64 | ARIN | US | 30th 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 |
| 2605:43c0::/32 | 4.3B × /64 | ARIN | US | 13th May 2019 |
| 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 |
| 2605:4700::/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 |
| 2605:4b40::/32 | 4.3B × /64 | ARIN | US | 31st May 2019 |
| 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 |
| 2605:4d40::/32 | 4.3B × /64 | ARIN | US | 7th Jun 2019 |
| 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 |