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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in Japan
1,447 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 111.235.39.0/24 | 256 | APNIC |  JP | 7th Aug 2009 |
| 111.235.46.0/23 | 512 | APNIC | JP | 7th Aug 2009 |
| 113.192.20.0/23 | 512 | APNIC | JP | 7th Dec 2023 |
| 113.192.22.0/23 | 512 | APNIC | JP | 7th Dec 2023 |
| 113.212.128.0/19 | 8.2k | APNIC | JP | 9th Dec 2008 |
| 115.166.144.0/20 | 4.1k | APNIC | JP | 1st Sept 2008 |
| 115.31.208.0/20 | 4.1k | APNIC | JP | 14th Jul 2008 |
| 116.213.20.0/22 | 1k | APNIC | JP | 7th Jan 2011 |
| 116.92.1.0/24 | 256 | APNIC | JP | 22nd May 2007 |
| 116.92.11.0/24 | 256 | APNIC | JP | 22nd May 2007 |
| 116.92.12.0/23 | 512 | APNIC | JP | 22nd May 2007 |
| 116.92.131.0/24 | 256 | APNIC | JP | 22nd May 2007 |
| 116.92.132.0/24 | 256 | APNIC | JP | 22nd May 2007 |
| 116.92.134.0/23 | 512 | APNIC | JP | 22nd May 2007 |
| 116.92.136.0/21 | 2k | APNIC | JP | 22nd May 2007 |
| 116.92.144.0/20 | 4.1k | APNIC | JP | 22nd May 2007 |
| 116.92.15.0/24 | 256 | APNIC | JP | 22nd May 2007 |
| 116.92.16.0/20 | 4.1k | APNIC | JP | 22nd May 2007 |
| 116.92.160.0/20 | 4.1k | APNIC | JP | 22nd May 2007 |
| 116.92.176.0/21 | 2k | APNIC | JP | 22nd May 2007 |
| 116.92.248.0/21 | 2k | APNIC | JP | 22nd May 2007 |
| 116.92.3.0/24 | 256 | APNIC | JP | 22nd May 2007 |
| 116.92.32.0/19 | 8.2k | APNIC | JP | 22nd May 2007 |
| 116.92.5.0/24 | 256 | APNIC | JP | 22nd May 2007 |
| 116.92.6.0/24 | 256 | APNIC | JP | 22nd May 2007 |
| 116.92.7.0/24 | 256 | APNIC | JP | 22nd May 2007 |
| 118.107.152.0/21 | 2k | APNIC | JP | 11th Feb 2011 |
| 119.150.107.0/24 | 256 | APNIC | JP | 18th Feb 2008 |
| 119.150.108.0/22 | 1k | APNIC | JP | 18th Feb 2008 |
| 119.150.206.0/24 | 256 | APNIC | JP | 18th Feb 2008 |
| 119.150.207.0/24 | 256 | APNIC | JP | 18th Feb 2008 |
| 119.150.208.0/22 | 1k | APNIC | JP | 18th Feb 2008 |
| 119.150.212.0/24 | 256 | APNIC | JP | 18th Feb 2008 |
| 119.150.213.0/24 | 256 | APNIC | JP | 18th Feb 2008 |
| 119.150.214.0/24 | 256 | APNIC | JP | 18th Feb 2008 |
| 119.150.228.0/22 | 1k | APNIC | JP | 18th Feb 2008 |
| 119.150.232.0/22 | 1k | APNIC | JP | 18th Feb 2008 |
| 119.150.236.0/24 | 256 | APNIC | JP | 18th Feb 2008 |
| 119.150.237.0/24 | 256 | APNIC | JP | 18th Feb 2008 |
| 119.150.238.0/24 | 256 | APNIC | JP | 18th Feb 2008 |
| 119.235.104.0/21 | 2k | APNIC | JP | 23rd Feb 2011 |
| 119.63.144.0/20 | 4.1k | APNIC | JP | 23rd Feb 2011 |
| 122.145.112.0/22 | 1k | APNIC | JP | 5th Jan 2007 |
| 122.145.130.0/24 | 256 | APNIC | JP | 5th Jan 2007 |
| 122.145.39.0/24 | 256 | APNIC | JP | 5th Jan 2007 |
| 122.200.128.0/22 | 1k | APNIC | JP | 30th Mar 2011 |
| 122.99.104.0/21 | 2k | APNIC | JP | 16th Oct 2007 |
| 123.253.16.0/22 | 1k | APNIC | JP | 13th May 2019 |
| 124.147.32.0/19 | 8.2k | APNIC | JP | 15th Mar 2006 |
| 124.26.0.0/15 | 131k | APNIC | JP | 14th Mar 2006 |