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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 203.120.204.0/23 | 512 | APNIC |  JP | 11th Feb 1996 |
| 203.120.207.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.209.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.211.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.217.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.224.0/22 | 1k | APNIC | JP | 11th Feb 1996 |
| 203.120.235.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.237.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.240.0/23 | 512 | APNIC | JP | 11th Feb 1996 |
| 203.120.246.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.250.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.255.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.28.0/22 | 1k | APNIC | JP | 19th May 1995 |
| 203.120.32.0/23 | 512 | APNIC | JP | 13th Jul 1995 |
| 203.120.36.0/22 | 1k | APNIC | JP | 13th Jul 1995 |
| 203.120.4.0/23 | 512 | APNIC | JP | 19th May 1995 |
| 203.120.41.0/24 | 256 | APNIC | JP | 13th Jul 1995 |
| 203.120.45.0/24 | 256 | APNIC | JP | 13th Jul 1995 |
| 203.120.55.0/24 | 256 | APNIC | JP | 13th Jul 1995 |
| 203.120.56.0/23 | 512 | APNIC | JP | 13th Jul 1995 |
| 203.120.59.0/24 | 256 | APNIC | JP | 13th Jul 1995 |
| 203.120.6.0/24 | 256 | APNIC | JP | 19th May 1995 |
| 203.120.70.0/24 | 256 | APNIC | JP | 19th Oct 1995 |
| 203.120.72.0/22 | 1k | APNIC | JP | 19th Oct 1995 |
| 203.120.76.0/24 | 256 | APNIC | JP | 19th Oct 1995 |
| 203.120.78.0/23 | 512 | APNIC | JP | 19th Oct 1995 |
| 203.120.80.0/24 | 256 | APNIC | JP | 19th Oct 1995 |
| 203.120.82.0/23 | 512 | APNIC | JP | 19th Oct 1995 |
| 203.120.84.0/23 | 512 | APNIC | JP | 19th Oct 1995 |
| 203.120.87.0/24 | 256 | APNIC | JP | 19th Oct 1995 |
| 203.120.88.0/24 | 256 | APNIC | JP | 19th Oct 1995 |
| 203.120.91.0/24 | 256 | APNIC | JP | 19th Oct 1995 |
| 203.121.146.0/23 | 512 | APNIC | JP | 24th Mar 2000 |
| 203.121.154.0/23 | 512 | APNIC | JP | 24th Mar 2000 |
| 203.121.156.0/23 | 512 | APNIC | JP | 24th Mar 2000 |
| 203.121.158.0/24 | 256 | APNIC | JP | 24th Mar 2000 |
| 203.121.167.0/24 | 256 | APNIC | JP | 17th Jan 2003 |
| 203.121.170.0/24 | 256 | APNIC | JP | 17th Jan 2003 |
| 203.121.175.0/24 | 256 | APNIC | JP | 17th Jan 2003 |
| 203.121.176.0/23 | 512 | APNIC | JP | 17th Jan 2003 |
| 203.121.181.0/24 | 256 | APNIC | JP | 17th Jan 2003 |
| 203.121.183.0/24 | 256 | APNIC | JP | 17th Jan 2003 |
| 203.121.184.0/24 | 256 | APNIC | JP | 17th Jan 2003 |
| 203.121.187.0/24 | 256 | APNIC | JP | 17th Jan 2003 |
| 203.121.189.0/24 | 256 | APNIC | JP | 17th Jan 2003 |
| 203.121.190.0/23 | 512 | APNIC | JP | 17th Jan 2003 |
| 203.124.6.0/23 | 512 | APNIC | JP | 26th Mar 2007 |
| 203.129.160.0/19 | 8.2k | APNIC | JP | 15th Mar 2005 |
| 203.14.212.0/24 | 256 | APNIC | JP | 20th Jul 2005 |
| 203.152.10.0/24 | 256 | APNIC | JP | 15th Jan 2003 |