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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.47.100.0/24 | 256 | APNIC |  JP | 30th Dec 1992 |
| 192.47.101.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.102.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.103.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.104.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.105.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.106.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.107.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.108.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.109.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.110.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.111.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.112.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.113.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.114.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.115.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.116.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.117.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.118.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.119.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.120.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.121.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.122.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.123.0/24 | 256 | APNIC | JP | 11th Jul 1994 |
| 192.47.124.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.125.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.126.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.127.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.128.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.129.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.130.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.131.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.132.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.133.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.134.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.135.0/24 | 256 | APNIC | JP | 30th Dec 1992 |
| 192.47.136.0/24 | 256 | APNIC | JP | 13th Apr 1993 |
| 192.47.137.0/24 | 256 | APNIC | JP | 13th Apr 1993 |
| 192.47.138.0/24 | 256 | APNIC | JP | 13th Apr 1993 |
| 192.47.139.0/24 | 256 | APNIC | JP | 13th Apr 1993 |
| 192.47.140.0/24 | 256 | APNIC | JP | 13th Apr 1993 |
| 192.47.141.0/24 | 256 | APNIC | JP | 13th Apr 1993 |
| 192.47.142.0/24 | 256 | APNIC | JP | 13th Apr 1993 |
| 192.47.143.0/24 | 256 | APNIC | JP | 12th Jan 1989 |
| 192.47.180.0/22 | 1k | APNIC | JP | 10th Aug 1995 |
| 192.47.184.0/21 | 2k | APNIC | JP | 31st Dec 1992 |
| 192.47.192.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.193.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.194.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.195.0/24 | 256 | APNIC | JP | 31st Dec 1992 |