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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,424 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2406:3700::/32 | 4.3B × /64 | APNIC |  CN | 4th Feb 2013 |
| 2406:3740::/32 | 4.3B × /64 | APNIC |  BD | 3rd Jul 2020 |
| 2406:3780::/32 | 4.3B × /64 | APNIC | CN | 2nd Aug 2016 |
| 2406:37c0::/32 | 4.3B × /64 | APNIC |  IN | 3rd Jul 2020 |
| 2406:3800::/32 | 4.3B × /64 | APNIC |  HK | 26th Mar 2009 |
| 2406:3840::/32 | 4.3B × /64 | APNIC |  ID | 3rd Jul 2020 |
| 2406:3880::/32 | 4.3B × /64 | APNIC | CN | 2nd Aug 2016 |
| 2406:3940::/32 | 4.3B × /64 | APNIC |  AF | 5th Jul 2020 |
| 2406:3980::/32 | 4.3B × /64 | APNIC | CN | 2nd Aug 2016 |
| 2406:39c0::/32 | 4.3B × /64 | APNIC | CN | 6th Jul 2020 |
| 2406:3ac0::/32 | 4.3B × /64 | APNIC | CN | 6th Jul 2020 |
| 2406:3b00::/32 | 4.3B × /64 | APNIC |  AU | 11th Feb 2013 |
| 2406:3b40::/32 | 4.3B × /64 | APNIC |  NZ | 7th Jul 2020 |
| 2406:3bc0::/32 | 4.3B × /64 | APNIC |  FR | 7th Jul 2020 |
| 2406:3c40::/32 | 4.3B × /64 | APNIC | AU | 8th Jul 2020 |
| 2406:3cc0::/32 | 4.3B × /64 | APNIC | IN | 8th Jul 2020 |
| 2406:3d00::/32 | 4.3B × /64 | APNIC | NZ | 11th Feb 2013 |
| 2406:3dc0::/32 | 4.3B × /64 | APNIC |  US | 9th Jul 2020 |
| 2406:3e40::/32 | 4.3B × /64 | APNIC | ID | 10th Jul 2020 |
| 2406:3e80::/32 | 4.3B × /64 | APNIC | CN | 3rd Aug 2016 |
| 2406:3ec0::/32 | 4.3B × /64 | APNIC | IN | 10th Jul 2020 |
| 2406:3f00::/32 | 4.3B × /64 | APNIC | IN | 12th Feb 2013 |
| 2406:3f80::/32 | 4.3B × /64 | APNIC | CN | 3rd Aug 2016 |
| 2406:4000::/32 | 4.3B × /64 | APNIC |  KR | 16th Mar 2007 |
| 2406:400::/32 | 4.3B × /64 | APNIC |  TH | 12th Feb 2010 |
| 2406:4040::/32 | 4.3B × /64 | APNIC |  VN | 13th Jul 2020 |
| 2406:4080::/32 | 4.3B × /64 | APNIC | CN | 3rd Aug 2016 |
| 2406:40::/32 | 4.3B × /64 | APNIC | CN | 15th Apr 2020 |
| 2406:40c0::/32 | 4.3B × /64 | APNIC | CN | 14th Jul 2020 |
| 2406:4100::/32 | 4.3B × /64 | APNIC | AU | 14th Feb 2013 |
| 2406:4180::/32 | 4.3B × /64 | APNIC | CN | 3rd Aug 2016 |
| 2406:4200::/32 | 4.3B × /64 | APNIC | AU | 14th Jan 2011 |
| 2406:4240::/32 | 4.3B × /64 | APNIC | ID | 15th Jul 2020 |
| 2406:4280::/32 | 4.3B × /64 | APNIC | CN | 3rd Aug 2016 |
| 2406:42c0::/32 | 4.3B × /64 | APNIC | CN | 16th Jul 2020 |
| 2406:4340::/32 | 4.3B × /64 | APNIC | CN | 17th Jul 2020 |
| 2406:4380::/32 | 4.3B × /64 | APNIC | CN | 3rd Aug 2016 |
| 2406:43c0::/32 | 4.3B × /64 | APNIC | CN | 18th Jul 2020 |
| 2406:4400::/32 | 4.3B × /64 | APNIC |  PH | 15th Feb 2010 |
| 2406:440::/32 | 4.3B × /64 | APNIC | CN | 16th Apr 2020 |
| 2406:4480::/32 | 4.3B × /64 | APNIC | CN | 3rd Aug 2016 |
| 2406:44c0::/32 | 4.3B × /64 | APNIC | ID | 20th Jul 2020 |
| 2406:4500::/32 | 4.3B × /64 | APNIC | CN | 25th Feb 2013 |
| 2406:4600::/32 | 4.3B × /64 | APNIC | AU | 14th Jan 2011 |
| 2406:4680::/32 | 4.3B × /64 | APNIC | CN | 4th Aug 2016 |
| 2406:4740::/32 | 4.3B × /64 | APNIC | BD | 22nd Jul 2020 |
| 2406:4800::/32 | 4.3B × /64 | APNIC |  SG | 30th Mar 2009 |
| 2406:4840::/32 | 4.3B × /64 | APNIC | BD | 22nd Jul 2020 |
| 2406:49c0::/32 | 4.3B × /64 | APNIC | ID | 24th Jul 2020 |
| 2406:4a40::/32 | 4.3B × /64 | APNIC |  NP | 27th Jul 2020 |