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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,195 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.66.152.0/21 | 2k | RIPE NCC |  DK | 7th Nov 1989 |
| 192.66.16.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.164.0/23 | 512 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.166.0/23 | 512 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.17.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.18.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.184.0/23 | 512 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.186.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.187.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.188.0/22 | 1k | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.19.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.192.0/21 | 2k | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.2.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.20.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.200.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.201.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.202.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.203.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.204.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.205.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.206.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.207.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.208.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.209.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.21.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.210.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.211.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.212.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.213.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.214.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.215.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.216.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.217.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.218.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.219.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.22.0/23 | 512 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.220.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.221.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.222.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.223.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.224.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.225.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.226.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.227.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.228.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.229.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.230.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.231.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.232.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.233.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |