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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
1,422 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 36.52.16.0/21 | 2k | APNIC | JP | 3rd Feb 2011 |
| 36.52.168.0/22 | 1k | APNIC | JP | 3rd Feb 2011 |
| 36.52.172.0/23 | 512 | APNIC | JP | 3rd Feb 2011 |
| 36.52.224.0/21 | 2k | APNIC | JP | 3rd Feb 2011 |
| 36.52.232.0/22 | 1k | APNIC | JP | 3rd Feb 2011 |
| 36.52.236.0/23 | 512 | APNIC | JP | 3rd Feb 2011 |
| 36.52.24.0/23 | 512 | APNIC | JP | 3rd Feb 2011 |
| 43.224.140.0/22 | 1k | APNIC | JP | 16th Jun 2017 |
| 43.239.248.0/24 | 256 | APNIC | JP | 19th Aug 2015 |
| 43.246.244.0/22 | 1k | APNIC | JP | 25th Aug 2015 |
| 45.113.116.0/22 | 1k | APNIC | JP | 18th Mar 2015 |
| 45.117.16.0/22 | 1k | APNIC | JP | 14th May 2015 |
| 49.156.160.0/19 | 8.2k | APNIC | JP | 26th Nov 2010 |
| 49.50.6.0/23 | 512 | APNIC | JP | 26th Oct 2010 |
| 58.145.240.0/20 | 4.1k | APNIC | JP | 14th Jun 2005 |
| 59.156.135.0/24 | 256 | APNIC | JP | 18th Nov 2004 |
| 59.156.136.0/22 | 1k | APNIC | JP | 18th Nov 2004 |
| 59.156.140.0/22 | 1k | APNIC | JP | 18th Nov 2004 |
| 59.156.200.0/23 | 512 | APNIC | JP | 18th Nov 2004 |
| 59.156.202.0/24 | 256 | APNIC | JP | 18th Nov 2004 |
| 59.156.21.0/24 | 256 | APNIC | JP | 18th Nov 2004 |
| 59.156.22.0/23 | 512 | APNIC | JP | 18th Nov 2004 |
| 59.156.25.0/24 | 256 | APNIC | JP | 18th Nov 2004 |
| 59.156.26.0/23 | 512 | APNIC | JP | 18th Nov 2004 |
| 59.156.28.0/24 | 256 | APNIC | JP | 18th Nov 2004 |
| 59.157.208.0/20 | 4.1k | APNIC | JP | 18th Nov 2004 |
| 60.254.192.0/18 | 16.4k | APNIC | JP | 1st Sept 2006 |
| 61.245.104.0/22 | 1k | APNIC | JP | 21st Jul 2005 |
| 61.245.124.0/22 | 1k | APNIC | JP | 21st Jul 2005 |
| 61.44.0.0/23 | 512 | APNIC | JP | 28th Aug 2003 |
| 61.44.2.0/24 | 256 | APNIC | JP | 28th Aug 2003 |
| 61.44.3.0/24 | 256 | APNIC | JP | 28th Aug 2003 |
| 61.44.4.0/22 | 1k | APNIC | JP | 28th Aug 2003 |
| 61.44.67.0/24 | 256 | APNIC | JP | 26th Sept 2003 |
| 61.44.8.0/21 | 2k | APNIC | JP | 28th Aug 2003 |
| 61.47.0.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.102.0/23 | 512 | APNIC | JP | 1st Mar 2005 |
| 61.47.108.0/22 | 1k | APNIC | JP | 1st Mar 2005 |
| 61.47.15.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.17.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.21.0/24 | 256 | APNIC | JP | 1st Mar 2005 |
| 61.47.22.0/24 | 256 | APNIC | JP | 1st Mar 2005 |