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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 160.21.80.0/20 | 4.1k | APNIC |  JP | 25th Jun 1992 |
| 160.21.96.0/21 | 2k | APNIC | JP | 25th Jun 1992 |
| 160.215.0.0/16 | 65.5k | APNIC | JP | 16th Mar 2012 |
| 160.236.116.0/23 | 512 | APNIC | JP | 17th Jul 2026 |
| 160.236.70.0/23 | 512 | APNIC | JP | 6th Jul 2026 |
| 160.24.0.0/16 | 65.5k | APNIC | JP | 24th Jun 1992 |
| 160.240.0.0/15 | 131k | APNIC | JP | 19th Apr 1993 |
| 160.243.0.0/16 | 65.5k | APNIC | JP | 19th Apr 1993 |
| 160.244.0.0/16 | 65.5k | APNIC | JP | 21st Dec 1992 |
| 160.248.13.0/24 | 256 | APNIC | JP | 19th Apr 1993 |
| 160.248.176.0/21 | 2k | APNIC | JP | 19th Apr 1993 |
| 160.248.202.0/24 | 256 | APNIC | JP | 19th Apr 1993 |
| 160.248.206.0/24 | 256 | APNIC | JP | 19th Apr 1993 |
| 160.248.224.0/21 | 2k | APNIC | JP | 19th Apr 1993 |
| 160.248.236.0/22 | 1k | APNIC | JP | 19th Apr 1993 |
| 160.248.240.0/24 | 256 | APNIC | JP | 19th Apr 1993 |
| 160.248.254.0/24 | 256 | APNIC | JP | 19th Apr 1993 |
| 160.248.70.0/23 | 512 | APNIC | JP | 19th Apr 1993 |
| 160.248.72.0/23 | 512 | APNIC | JP | 19th Apr 1993 |
| 160.248.82.0/24 | 256 | APNIC | JP | 19th Apr 1993 |
| 160.248.85.0/24 | 256 | APNIC | JP | 19th Apr 1993 |
| 160.248.86.0/24 | 256 | APNIC | JP | 19th Apr 1993 |
| 160.248.89.0/24 | 256 | APNIC | JP | 19th Apr 1993 |
| 161.75.0.0/16 | 65.5k | APNIC | JP | 13th Mar 1996 |
| 161.93.0.0/16 | 65.5k | APNIC | JP | 23rd Jun 1992 |
| 161.94.0.0/15 | 131k | APNIC | JP | 23rd Jun 1992 |
| 161.96.0.0/16 | 65.5k | APNIC | JP | 23rd Jun 1992 |
| 162.4.238.0/24 | 256 | APNIC | JP | 12th Jun 2026 |
| 162.4.28.0/23 | 512 | APNIC | JP | 22nd Apr 2026 |
| 162.4.79.0/24 | 256 | APNIC | JP | 5th May 2026 |
| 163.128.118.0/24 | 256 | APNIC | JP | 26th Mar 2026 |
| 163.128.26.0/23 | 512 | APNIC | JP | 9th Mar 2026 |
| 163.132.0.0/16 | 65.5k | APNIC | JP | 30th Nov 1992 |
| 163.133.0.0/16 | 65.5k | APNIC | JP | 30th Nov 1992 |
| 163.136.0.0/16 | 65.5k | APNIC | JP | 30th Nov 1992 |
| 163.141.0.0/16 | 65.5k | APNIC | JP | 30th Nov 1992 |
| 163.146.0.0/16 | 65.5k | APNIC | JP | 30th Nov 1992 |
| 163.147.0.0/16 | 65.5k | APNIC | JP | 30th Nov 1992 |
| 163.149.0.0/16 | 65.5k | APNIC | JP | 1st Dec 1992 |
| 163.217.0.0/16 | 65.5k | APNIC | JP | 12th Apr 1993 |
| 163.219.0.0/16 | 65.5k | APNIC | JP | 12th Apr 1993 |
| 163.220.160.0/20 | 4.1k | APNIC | JP | 2nd Apr 1993 |
| 163.224.0.0/16 | 65.5k | APNIC | JP | 16th Apr 1993 |
| 163.227.1.0/24 | 256 | APNIC | JP | 16th Apr 1993 |
| 163.227.125.0/24 | 256 | APNIC | JP | 16th Apr 1993 |
| 163.227.17.0/24 | 256 | APNIC | JP | 16th Apr 1993 |
| 163.227.221.0/24 | 256 | APNIC | JP | 16th Apr 1993 |
| 163.227.225.0/24 | 256 | APNIC | JP | 16th Apr 1993 |
| 163.227.226.0/23 | 512 | APNIC | JP | 16th Apr 1993 |
| 163.227.233.0/24 | 256 | APNIC | JP | 16th Apr 1993 |