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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.66.234.0/24 | 256 | RIPE NCC |  DK | 7th Nov 1989 |
| 192.66.235.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.236.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.237.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.238.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.239.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.240.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.241.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.242.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.243.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.244.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.245.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.246.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.247.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.248.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.249.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.250.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.251.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.252.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.253.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.254.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.255.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.4.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.40.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.50.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.51.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.52.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.53.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.54.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.55.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.56.0/22 | 1k | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.64.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.65.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.66.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.67.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.68.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.69.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.70.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.71.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.72.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.73.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.74.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.75.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.76.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.77.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.78.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.79.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.80.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.81.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |
| 192.66.82.0/24 | 256 | RIPE NCC | DK | 7th Nov 1989 |