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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through APNIC, largest first.
Unannounced blocks in Japan
1,422 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 202.53.208.0/20 | 4.1k | APNIC |  JP | 26th Mar 2004 |
| 202.58.4.0/22 | 1k | APNIC | JP | 8th Apr 2005 |
| 202.60.16.0/20 | 4.1k | APNIC | JP | 21st Jun 2004 |
| 202.64.100.0/24 | 256 | APNIC | JP | 18th Mar 1994 |
| 202.64.102.0/23 | 512 | APNIC | JP | 18th Mar 1994 |
| 202.64.109.0/24 | 256 | APNIC | JP | 18th Mar 1994 |
| 202.64.121.0/24 | 256 | APNIC | JP | 18th Mar 1994 |
| 202.64.123.0/24 | 256 | APNIC | JP | 18th Mar 1994 |
| 202.64.234.0/24 | 256 | APNIC | JP | 18th Mar 1994 |
| 202.64.240.0/24 | 256 | APNIC | JP | 18th Mar 1994 |
| 202.64.25.0/24 | 256 | APNIC | JP | 18th Mar 1994 |
| 202.64.64.0/23 | 512 | APNIC | JP | 18th Mar 1994 |
| 202.64.87.0/24 | 256 | APNIC | JP | 18th Mar 1994 |
| 202.74.47.0/24 | 256 | APNIC | JP | 18th Nov 2010 |
| 202.8.26.0/23 | 512 | APNIC | JP | 5th Aug 2003 |
| 202.86.224.0/20 | 4.1k | APNIC | JP | 4th Oct 2004 |
| 202.87.224.0/20 | 4.1k | APNIC | JP | 13th Oct 2004 |
| 202.87.64.0/20 | 4.1k | APNIC | JP | 4th Oct 2004 |
| 202.90.176.0/20 | 4.1k | APNIC | JP | 17th Nov 2003 |
| 202.91.112.0/20 | 4.1k | APNIC | JP | 18th Nov 2004 |
| 203.118.252.0/22 | 1k | APNIC | JP | 28th Oct 2008 |
| 203.119.22.0/23 | 512 | APNIC | JP | 18th Jan 2011 |
| 203.120.1.0/24 | 256 | APNIC | JP | 19th May 1995 |
| 203.120.108.0/23 | 512 | APNIC | JP | 19th Oct 1995 |
| 203.120.111.0/24 | 256 | APNIC | JP | 19th Oct 1995 |
| 203.120.120.0/24 | 256 | APNIC | JP | 19th Oct 1995 |
| 203.120.122.0/23 | 512 | APNIC | JP | 19th Oct 1995 |
| 203.120.125.0/24 | 256 | APNIC | JP | 19th Oct 1995 |
| 203.120.127.0/24 | 256 | APNIC | JP | 19th Oct 1995 |
| 203.120.130.0/23 | 512 | APNIC | JP | 11th Feb 1996 |
| 203.120.136.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.138.0/23 | 512 | APNIC | JP | 11th Feb 1996 |
| 203.120.146.0/23 | 512 | APNIC | JP | 11th Feb 1996 |
| 203.120.148.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.154.0/23 | 512 | APNIC | JP | 11th Feb 1996 |
| 203.120.158.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.164.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.166.0/23 | 512 | APNIC | JP | 11th Feb 1996 |
| 203.120.173.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.177.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.180.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.182.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.186.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.190.0/23 | 512 | APNIC | JP | 11th Feb 1996 |
| 203.120.193.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.194.0/23 | 512 | APNIC | JP | 11th Feb 1996 |
| 203.120.197.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.199.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.2.0/23 | 512 | APNIC | JP | 19th May 1995 |
| 203.120.200.0/24 | 256 | APNIC | JP | 11th Feb 1996 |