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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 103.52.240.0/22 | 1k | APNIC |  JP | 17th Mar 2015 |
| 103.53.12.0/22 | 1k | APNIC | JP | 18th Mar 2015 |
| 103.54.208.0/22 | 1k | APNIC | JP | 9th Apr 2015 |
| 103.54.228.0/23 | 512 | APNIC | JP | 15th Dec 2022 |
| 103.55.157.0/24 | 256 | APNIC | JP | 21st Apr 2015 |
| 103.56.48.0/22 | 1k | APNIC | JP | 28th Apr 2015 |
| 103.57.100.0/22 | 1k | APNIC | JP | 15th May 2015 |
| 103.57.144.0/22 | 1k | APNIC | JP | 21st May 2015 |
| 103.57.28.0/22 | 1k | APNIC | JP | 12th May 2015 |
| 103.57.44.0/22 | 1k | APNIC | JP | 13th May 2015 |
| 103.59.136.0/22 | 1k | APNIC | JP | 4th Jun 2015 |
| 103.6.112.0/22 | 1k | APNIC | JP | 24th Feb 2012 |
| 103.6.68.0/22 | 1k | APNIC | JP | 21st Feb 2012 |
| 103.6.92.0/22 | 1k | APNIC | JP | 21st Feb 2012 |
| 103.60.36.0/22 | 1k | APNIC | JP | 10th Jun 2015 |
| 103.61.244.0/22 | 1k | APNIC | JP | 2nd Jul 2015 |
| 103.62.244.0/22 | 1k | APNIC | JP | 9th Jul 2015 |
| 103.65.130.0/23 | 512 | APNIC | JP | 11th Oct 2023 |
| 103.66.171.0/24 | 256 | APNIC | JP | 21st Jun 2016 |
| 103.68.12.0/22 | 1k | APNIC | JP | 29th Jun 2016 |
| 103.68.184.0/22 | 1k | APNIC | JP | 6th Jul 2016 |
| 103.7.134.0/24 | 256 | APNIC | JP | 26th Mar 2012 |
| 103.71.36.0/22 | 1k | APNIC | JP | 5th Aug 2016 |
| 103.75.252.0/22 | 1k | APNIC | JP | 26th Sept 2016 |
| 103.79.176.0/23 | 512 | APNIC | JP | 1st May 2023 |
| 103.8.48.0/22 | 1k | APNIC | JP | 12th Apr 2012 |
| 103.80.104.0/22 | 1k | APNIC | JP | 29th Nov 2016 |
| 103.80.204.0/22 | 1k | APNIC | JP | 5th Dec 2016 |
| 103.82.112.0/22 | 1k | APNIC | JP | 28th Dec 2016 |
| 103.84.167.0/24 | 256 | APNIC | JP | 31st Jan 2017 |
| 103.87.144.0/22 | 1k | APNIC | JP | 8th Mar 2017 |
| 103.9.120.0/22 | 1k | APNIC | JP | 14th May 2012 |
| 103.9.172.0/22 | 1k | APNIC | JP | 18th May 2012 |
| 103.9.180.0/24 | 256 | APNIC | JP | 28th May 2012 |
| 103.95.163.0/24 | 256 | APNIC | JP | 23rd Jun 2017 |
| 110.74.0.0/19 | 8.2k | APNIC | JP | 27th Mar 2009 |
| 110.74.117.0/24 | 256 | APNIC | JP | 27th Mar 2009 |
| 110.74.118.0/23 | 512 | APNIC | JP | 27th Mar 2009 |
| 110.74.120.0/24 | 256 | APNIC | JP | 27th Mar 2009 |
| 110.74.124.0/23 | 512 | APNIC | JP | 27th Mar 2009 |
| 111.119.0.0/19 | 8.2k | APNIC | JP | 2nd Jul 2009 |
| 111.221.60.0/22 | 1k | APNIC | JP | 24th Jul 2009 |
| 111.223.192.0/19 | 8.2k | APNIC | JP | 20th Jul 2009 |
| 111.234.120.0/21 | 2k | APNIC | JP | 7th Aug 2009 |
| 111.234.192.0/20 | 4.1k | APNIC | JP | 7th Aug 2009 |
| 111.234.208.0/21 | 2k | APNIC | JP | 7th Aug 2009 |
| 111.234.216.0/23 | 512 | APNIC | JP | 7th Aug 2009 |
| 111.234.246.0/23 | 512 | APNIC | JP | 7th Aug 2009 |
| 111.234.248.0/21 | 2k | APNIC | JP | 7th Aug 2009 |
| 111.234.48.0/22 | 1k | APNIC | JP | 7th Aug 2009 |