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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 210.24.184.0/24 | 256 | APNIC |  JP | 16th Dec 1996 |
| 210.24.186.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.188.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.191.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.193.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.194.0/23 | 512 | APNIC | JP | 16th Dec 1996 |
| 210.24.199.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.200.0/23 | 512 | APNIC | JP | 16th Dec 1996 |
| 210.24.204.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.206.0/23 | 512 | APNIC | JP | 16th Dec 1996 |
| 210.24.213.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.215.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.217.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.220.0/22 | 1k | APNIC | JP | 16th Dec 1996 |
| 210.24.225.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.227.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.231.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.233.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.235.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.239.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.241.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.243.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.247.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.248.0/21 | 2k | APNIC | JP | 16th Dec 1996 |
| 210.24.48.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.53.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.55.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.65.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.66.0/23 | 512 | APNIC | JP | 16th Dec 1996 |
| 210.24.68.0/22 | 1k | APNIC | JP | 16th Dec 1996 |
| 210.24.72.0/21 | 2k | APNIC | JP | 16th Dec 1996 |
| 210.24.80.0/23 | 512 | APNIC | JP | 16th Dec 1996 |
| 210.24.84.0/23 | 512 | APNIC | JP | 16th Dec 1996 |
| 210.24.87.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.88.0/21 | 2k | APNIC | JP | 16th Dec 1996 |
| 210.247.2.0/24 | 256 | APNIC | JP | 1st Apr 2004 |
| 210.247.3.0/24 | 256 | APNIC | JP | 1st Apr 2004 |
| 210.88.128.0/20 | 4.1k | APNIC | JP | 10th Dec 1998 |
| 210.88.16.0/20 | 4.1k | APNIC | JP | 22nd Oct 1997 |
| 210.88.192.0/20 | 4.1k | APNIC | JP | 22nd May 2000 |
| 210.88.208.0/21 | 2k | APNIC | JP | 22nd May 2000 |
| 210.88.216.0/22 | 1k | APNIC | JP | 22nd May 2000 |
| 210.88.220.0/23 | 512 | APNIC | JP | 22nd May 2000 |
| 210.88.222.0/24 | 256 | APNIC | JP | 22nd May 2000 |
| 210.88.223.0/24 | 256 | APNIC | JP | 22nd May 2000 |
| 210.88.224.0/21 | 2k | APNIC | JP | 27th Mar 2001 |
| 210.88.232.0/23 | 512 | APNIC | JP | 27th Mar 2001 |
| 210.88.236.0/22 | 1k | APNIC | JP | 27th Mar 2001 |
| 210.88.240.0/20 | 4.1k | APNIC | JP | 27th Mar 2001 |
| 210.88.32.0/20 | 4.1k | APNIC | JP | 22nd Oct 1997 |