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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
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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 |
|---|---|---|---|---|
| 157.120.160.0/19 | 8.2k | APNIC |  JP | 8th Feb 1992 |
| 157.120.232.0/22 | 1k | APNIC | JP | 8th Feb 1992 |
| 157.14.2.0/23 | 512 | APNIC | JP | 15th Apr 1993 |
| 157.15.254.0/23 | 512 | APNIC | JP | 13th Feb 2024 |
| 157.15.56.0/23 | 512 | APNIC | JP | 29th Jan 2024 |
| 157.250.128.0/19 | 8.2k | APNIC | JP | 7th Feb 1992 |
| 157.250.176.0/20 | 4.1k | APNIC | JP | 7th Feb 1992 |
| 157.250.208.0/20 | 4.1k | APNIC | JP | 7th Feb 1992 |
| 157.66.182.0/23 | 512 | APNIC | JP | 30th Apr 2024 |
| 157.68.0.0/16 | 65.5k | APNIC | JP | 10th Feb 1992 |
| 157.69.0.0/16 | 65.5k | APNIC | JP | 10th Feb 1992 |
| 157.70.128.0/19 | 8.2k | APNIC | JP | 10th Feb 1992 |
| 157.8.120.0/21 | 2k | APNIC | JP | 21st Apr 1993 |
| 157.8.128.0/19 | 8.2k | APNIC | JP | 21st Apr 1993 |
| 157.8.16.0/20 | 4.1k | APNIC | JP | 21st Apr 1993 |
| 157.8.160.0/22 | 1k | APNIC | JP | 21st Apr 1993 |
| 157.8.200.0/21 | 2k | APNIC | JP | 21st Apr 1993 |
| 157.8.208.0/20 | 4.1k | APNIC | JP | 21st Apr 1993 |
| 157.8.224.0/20 | 4.1k | APNIC | JP | 21st Apr 1993 |
| 157.8.240.0/22 | 1k | APNIC | JP | 21st Apr 1993 |
| 157.8.32.0/19 | 8.2k | APNIC | JP | 21st Apr 1993 |
| 157.8.64.0/20 | 4.1k | APNIC | JP | 21st Apr 1993 |
| 157.8.8.0/21 | 2k | APNIC | JP | 21st Apr 1993 |
| 157.8.88.0/21 | 2k | APNIC | JP | 21st Apr 1993 |
| 157.9.0.0/16 | 65.5k | APNIC | JP | 13th Apr 1993 |
| 158.199.0.0/19 | 8.2k | APNIC | JP | 25th Jun 1992 |
| 158.201.128.0/18 | 16.4k | APNIC | JP | 25th Jun 1992 |
| 158.201.192.0/20 | 4.1k | APNIC | JP | 25th Jun 1992 |
| 158.204.0.0/16 | 65.5k | APNIC | JP | 26th Jun 1992 |
| 158.206.0.0/16 | 65.5k | APNIC | JP | 26th Jun 1992 |
| 158.209.0.0/16 | 65.5k | APNIC | JP | 26th Jun 1992 |
| 158.211.0.0/16 | 65.5k | APNIC | JP | 26th Jun 1992 |
| 158.212.0.0/15 | 131k | APNIC | JP | 26th Jun 1992 |
| 158.214.0.0/16 | 65.5k | APNIC | JP | 26th Jun 1992 |
| 159.228.0.0/16 | 65.5k | APNIC | JP | 8th Feb 2011 |
| 159.80.0.0/16 | 65.5k | APNIC | JP | 20th Mar 1992 |
| 160.14.0.0/16 | 65.5k | APNIC | JP | 10th Jun 1992 |
| 160.187.224.0/23 | 512 | APNIC | JP | 9th Oct 2024 |
| 160.188.0.0/16 | 65.5k | APNIC | JP | 26th Jun 1992 |
| 160.191.142.0/23 | 512 | APNIC | JP | 30th Oct 2024 |
| 160.195.0.0/16 | 65.5k | APNIC | JP | 24th Jul 1992 |
| 160.196.0.0/16 | 65.5k | APNIC | JP | 24th Jul 1992 |
| 160.20.140.0/23 | 512 | APNIC | JP | 22nd May 2024 |
| 160.201.0.0/16 | 65.5k | APNIC | JP | 27th Jul 1992 |
| 160.203.0.0/16 | 65.5k | APNIC | JP | 27th Jul 1992 |
| 160.21.0.0/18 | 16.4k | APNIC | JP | 25th Jun 1992 |
| 160.21.128.0/20 | 4.1k | APNIC | JP | 25th Jun 1992 |
| 160.21.160.0/21 | 2k | APNIC | JP | 25th Jun 1992 |
| 160.21.176.0/20 | 4.1k | APNIC | JP | 25th Jun 1992 |
| 160.21.192.0/18 | 16.4k | APNIC | JP | 25th Jun 1992 |