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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.47.218.0/24 | 256 | APNIC |  JP | 31st Dec 1992 |
| 192.47.219.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.22.0/24 | 256 | APNIC | JP | 12th Jan 1989 |
| 192.47.220.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.221.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.222.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.223.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.224.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.225.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.226.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.227.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.228.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.229.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.23.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.230.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.231.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.232.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.233.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.234.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.235.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.236.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.237.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.238.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.239.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.24.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.240.0/24 | 256 | APNIC | JP | 25th Sept 1992 |
| 192.47.241.0/24 | 256 | APNIC | JP | 31st Dec 1992 |
| 192.47.242.0/24 | 256 | ARIN |  US | 12th Jan 1989 |
| 192.47.25.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.250.0/24 | 256 | ARIN | US | 14th Apr 1989 |
| 192.47.251.0/24 | 256 | ARIN | US | 14th Apr 1989 |
| 192.47.252.0/24 | 256 | ARIN | US | 14th Apr 1989 |
| 192.47.26.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.27.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.29.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.30.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.31.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.32.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.33.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.34.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.35.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.36.0/24 | 256 | AFRINIC |  CI | 28th Feb 2020 |
| 192.47.37.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.38.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.39.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.4.0/22 | 1k | APNIC | JP | 12th Jan 1989 |
| 192.47.40.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.41.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.42.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |
| 192.47.43.0/24 | 256 | APNIC | JP | 2nd Dec 1992 |