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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 202.42.112.0/20 | 4.1k | APNIC |  JP | 9th Jul 1999 |
| 202.42.136.0/24 | 256 | APNIC | JP | 9th Jul 1999 |
| 202.42.137.0/24 | 256 | APNIC | JP | 8th Sept 1999 |
| 202.42.138.0/23 | 512 | APNIC | JP | 31st Jan 1994 |
| 202.42.140.0/24 | 256 | APNIC | JP | 8th Sept 1999 |
| 202.42.148.0/24 | 256 | APNIC | JP | 18th Jun 1994 |
| 202.42.150.0/24 | 256 | APNIC | JP | 12th May 1994 |
| 202.42.151.0/24 | 256 | APNIC | JP | 20th May 1994 |
| 202.42.153.0/24 | 256 | APNIC | JP | 8th Sept 1999 |
| 202.42.156.0/24 | 256 | APNIC | JP | 8th Sept 1999 |
| 202.42.16.0/20 | 4.1k | APNIC | JP | 9th Jul 1999 |
| 202.42.160.0/24 | 256 | APNIC | JP | 8th Sept 1999 |
| 202.42.162.0/24 | 256 | APNIC | JP | 8th Sept 1999 |
| 202.42.164.0/24 | 256 | APNIC | JP | 11th Jul 1994 |
| 202.42.167.0/24 | 256 | APNIC | JP | 8th Sept 1999 |
| 202.42.168.0/23 | 512 | APNIC | JP | 8th Sept 1999 |
| 202.42.172.0/24 | 256 | APNIC | JP | 8th Sept 1999 |
| 202.42.174.0/24 | 256 | APNIC | JP | 4th Oct 1994 |
| 202.42.177.0/24 | 256 | APNIC | JP | 11th Sept 2001 |
| 202.42.178.0/23 | 512 | APNIC | JP | 11th Sept 2001 |
| 202.42.180.0/23 | 512 | APNIC | JP | 11th Sept 2001 |
| 202.42.183.0/24 | 256 | APNIC | JP | 11th Sept 2001 |
| 202.42.188.0/23 | 512 | APNIC | JP | 11th Sept 2001 |
| 202.42.202.0/24 | 256 | APNIC | JP | 8th Sept 1999 |
| 202.42.204.0/24 | 256 | APNIC | JP | 8th Sept 1999 |
| 202.42.214.0/24 | 256 | APNIC | JP | 8th Sept 1999 |
| 202.42.216.0/23 | 512 | APNIC | JP | 8th Sept 1999 |
| 202.42.218.0/24 | 256 | APNIC | JP | 8th Sept 1999 |
| 202.42.222.0/23 | 512 | APNIC | JP | 8th Sept 1999 |
| 202.42.224.0/23 | 512 | APNIC | JP | 8th Sept 1999 |
| 202.42.227.0/24 | 256 | APNIC | JP | 8th Sept 1999 |
| 202.42.229.0/24 | 256 | APNIC | JP | 8th Sept 1999 |
| 202.42.230.0/24 | 256 | APNIC | JP | 8th Sept 1999 |
| 202.42.232.0/24 | 256 | APNIC | JP | 8th Sept 1999 |
| 202.42.238.0/24 | 256 | APNIC | JP | 8th Sept 1999 |
| 202.42.50.0/24 | 256 | APNIC | JP | 9th Jul 1999 |
| 202.42.55.0/24 | 256 | APNIC | JP | 9th Jul 1999 |
| 202.42.57.0/24 | 256 | APNIC | JP | 9th Jul 1999 |
| 202.42.58.0/24 | 256 | APNIC | JP | 9th Jul 1999 |
| 202.42.66.0/24 | 256 | APNIC | JP | 9th Jul 1999 |
| 202.42.68.0/23 | 512 | APNIC | JP | 9th Jul 1999 |
| 202.42.71.0/24 | 256 | APNIC | JP | 9th Jul 1999 |
| 202.42.72.0/21 | 2k | APNIC | JP | 9th Jul 1999 |
| 202.42.8.0/21 | 2k | APNIC | JP | 9th Jul 1999 |
| 202.42.80.0/20 | 4.1k | APNIC | JP | 9th Jul 1999 |
| 202.43.104.0/22 | 1k | APNIC | JP | 3rd Jun 2009 |
| 202.45.12.0/24 | 256 | APNIC | JP | 21st Jan 2005 |
| 202.45.129.0/24 | 256 | APNIC | JP | 29th Sept 2004 |
| 202.51.4.0/22 | 1k | APNIC | JP | 27th Jan 2005 |
| 202.52.151.0/24 | 256 | APNIC | JP | 12th Aug 2010 |