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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 the most unannounced blocks, largest first.
Unannounced blocks
85,201 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 192.47.196.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.197.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.198.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.199.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.20.0/24 | 256 | APNIC | JP | 30th Nov 1992 |
| 192.47.200.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.201.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.202.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.203.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.206.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.207.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.208.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.209.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.21.0/24 | 256 | APNIC | JP | 1st Dec 1992 |
| 192.47.210.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.211.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.212.0/22 | 1k | APNIC | JP | 31st Dec 1992 |
| 192.47.216.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.217.0/24 | 256 | APNIC | JP | 31st Dec 1992 |