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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with unannounced space registered through APNIC, largest first.
Unannounced blocks in Japan
1,414 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2407:e600::/32 | 4.3B × /64 | APNIC |  JP | 28th Mar 2011 |
| 2407:eb40::/32 | 4.3B × /64 | APNIC | JP | 25th Sept 2021 |
| 2407:ee40::/32 | 4.3B × /64 | APNIC | JP | 27th Sept 2021 |
| 2407:f240::/32 | 4.3B × /64 | APNIC | JP | 29th Sept 2021 |
| 2407:f600::/32 | 4.3B × /64 | APNIC | JP | 29th Mar 2011 |
| 27.120.176.0/22 | 1k | APNIC | JP | 2nd Sept 2010 |
| 27.122.4.0/22 | 1k | APNIC | JP | 2nd Mar 2011 |
| 27.122.48.0/21 | 2k | APNIC | JP | 4th Oct 2010 |
| 27.123.236.0/22 | 1k | APNIC | JP | 5th Aug 2016 |
| 27.126.160.0/20 | 4.1k | APNIC | JP | 19th Oct 2010 |
| 27.131.200.0/21 | 2k | APNIC | JP | 21st Apr 2010 |
| 27.131.240.0/21 | 2k | APNIC | JP | 23rd Apr 2010 |
| 27.132.0.0/21 | 2k | APNIC | JP | 21st Apr 2010 |
| 27.132.176.0/20 | 4.1k | APNIC | JP | 21st Apr 2010 |
| 27.133.10.0/23 | 512 | APNIC | JP | 21st Apr 2010 |
| 27.133.172.0/23 | 512 | APNIC | JP | 21st Apr 2010 |
| 27.133.174.0/24 | 256 | APNIC | JP | 21st Apr 2010 |
| 27.133.175.0/24 | 256 | APNIC | JP | 21st Apr 2010 |
| 27.133.208.0/20 | 4.1k | APNIC | JP | 21st Apr 2010 |
| 27.133.24.0/21 | 2k | APNIC | JP | 21st Apr 2010 |
| 27.133.32.0/21 | 2k | APNIC | JP | 21st Apr 2010 |
| 27.133.40.0/22 | 1k | APNIC | JP | 21st Apr 2010 |
| 27.133.44.0/23 | 512 | APNIC | JP | 21st Apr 2010 |
| 27.133.64.0/20 | 4.1k | APNIC | JP | 21st Apr 2010 |
| 27.133.80.0/21 | 2k | APNIC | JP | 21st Apr 2010 |
| 27.133.88.0/23 | 512 | APNIC | JP | 21st Apr 2010 |
| 27.134.16.0/22 | 1k | APNIC | JP | 21st Apr 2010 |
| 27.134.189.0/24 | 256 | APNIC | JP | 21st Apr 2010 |
| 27.134.190.0/23 | 512 | APNIC | JP | 21st Apr 2010 |
| 27.134.192.0/19 | 8.2k | APNIC | JP | 21st Apr 2010 |
| 27.134.20.0/23 | 512 | APNIC | JP | 21st Apr 2010 |
| 27.134.224.0/21 | 2k | APNIC | JP | 21st Apr 2010 |
| 27.134.232.0/22 | 1k | APNIC | JP | 21st Apr 2010 |
| 27.134.236.0/23 | 512 | APNIC | JP | 21st Apr 2010 |
| 27.134.238.0/23 | 512 | APNIC | JP | 21st Apr 2010 |
| 27.134.72.0/21 | 2k | APNIC | JP | 21st Apr 2010 |
| 27.134.96.0/19 | 8.2k | APNIC | JP | 21st Apr 2010 |
| 27.135.57.0/24 | 256 | APNIC | JP | 21st Apr 2010 |
| 27.135.58.0/23 | 512 | APNIC | JP | 21st Apr 2010 |
| 27.135.60.0/22 | 1k | APNIC | JP | 21st Apr 2010 |
| 27.135.64.0/21 | 2k | APNIC | JP | 21st Apr 2010 |
| 27.135.72.0/24 | 256 | APNIC | JP | 21st Apr 2010 |
| 27.34.192.0/19 | 8.2k | APNIC | JP | 25th Mar 2010 |
| 36.255.120.0/22 | 1k | APNIC | JP | 18th Feb 2016 |
| 36.255.160.0/22 | 1k | APNIC | JP | 22nd Feb 2016 |
| 36.255.36.0/22 | 1k | APNIC | JP | 11th Feb 2016 |
| 36.52.112.0/21 | 2k | APNIC | JP | 3rd Feb 2011 |
| 36.52.120.0/22 | 1k | APNIC | JP | 3rd Feb 2011 |
| 36.52.124.0/23 | 512 | APNIC | JP | 3rd Feb 2011 |
| 36.52.144.0/21 | 2k | APNIC | JP | 3rd Feb 2011 |