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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,149 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.206.39.0/24 | 256 | ARIN |  US | 6th Aug 1992 |
| 192.206.40.0/24 | 256 | ARIN | US | 6th Aug 1992 |
| 192.206.49.0/24 | 256 | ARIN | US | 17th Aug 1992 |
| 192.206.51.0/24 | 256 | ARIN | US | 17th Aug 1992 |
| 192.206.53.0/24 | 256 | ARIN | US | 23rd Jul 2015 |
| 192.206.57.0/24 | 256 | ARIN | US | 17th Aug 1992 |
| 192.206.59.0/24 | 256 | ARIN | US | 17th Aug 1992 |
| 192.206.60.0/24 | 256 | ARIN | US | 17th Aug 1992 |
| 192.206.61.0/24 | 256 | ARIN | US | 17th Aug 1992 |
| 192.206.62.0/24 | 256 | ARIN | US | 17th Aug 1992 |
| 192.206.63.0/24 | 256 | ARIN | US | 3rd Sept 2015 |
| 192.206.66.0/24 | 256 | ARIN | US | 17th Aug 1992 |
| 192.206.67.0/24 | 256 | ARIN | US | 17th Aug 1992 |
| 192.206.68.0/24 | 256 | ARIN | US | 17th Aug 1992 |
| 192.206.74.0/24 | 256 | ARIN | US | 18th Aug 1992 |
| 192.206.75.0/24 | 256 | ARIN | US | 18th Aug 1992 |
| 192.206.76.0/24 | 256 | ARIN | US | 18th Aug 1992 |
| 192.206.77.0/24 | 256 | RIPE NCC |  GB | 24th Aug 1992 |
| 192.206.78.0/24 | 256 | RIPE NCC | GB | 24th Aug 1992 |
| 192.206.79.0/24 | 256 | RIPE NCC | GB | 24th Aug 1992 |
| 192.206.80.0/24 | 256 | RIPE NCC | GB | 24th Aug 1992 |
| 192.206.81.0/24 | 256 | RIPE NCC | GB | 24th Aug 1992 |
| 192.206.82.0/24 | 256 | ARIN | US | 24th Aug 1992 |
| 192.206.83.0/24 | 256 | ARIN | US | 24th Aug 1992 |
| 192.206.84.0/24 | 256 | ARIN | US | 24th Aug 1992 |
| 192.206.85.0/24 | 256 | ARIN | US | 24th Aug 1992 |
| 192.206.86.0/24 | 256 | RIPE NCC |  IL | 24th Aug 1992 |
| 192.206.90.0/24 | 256 | ARIN | US | 24th Aug 1992 |
| 192.206.91.0/24 | 256 | ARIN | US | 24th Aug 1992 |
| 192.206.93.0/24 | 256 | ARIN |  CA | 24th Aug 1992 |
| 192.206.94.0/24 | 256 | ARIN | CA | 24th Aug 1992 |
| 192.206.96.0/24 | 256 | ARIN | US | 19th Oct 2020 |
| 192.206.97.0/24 | 256 | ARIN | US | 24th Aug 1992 |
| 192.206.98.0/24 | 256 | ARIN | US | 24th Aug 1992 |
| 192.206.99.0/24 | 256 | ARIN | US | 24th Aug 1992 |
| 192.207.103.0/24 | 256 | ARIN | US | 25th Aug 1992 |
| 192.207.106.0/24 | 256 | ARIN | US | 25th Aug 1992 |
| 192.207.107.0/24 | 256 | ARIN | US | 25th Aug 1992 |
| 192.207.113.0/24 | 256 | APNIC |  AU | 25th Aug 1992 |
| 192.207.115.0/24 | 256 | ARIN | US | 7th Aug 2015 |
| 192.207.116.0/24 | 256 | ARIN | US | 25th Aug 1992 |
| 192.207.117.0/24 | 256 | ARIN | US | 25th Aug 1992 |
| 192.207.118.0/24 | 256 | ARIN | US | 25th Aug 1992 |
| 192.207.119.0/24 | 256 | APNIC | AU | 26th Aug 1992 |
| 192.207.122.0/24 | 256 | ARIN | US | 29th Aug 1992 |
| 192.207.123.0/24 | 256 | ARIN | US | 29th Aug 1992 |
| 192.207.125.0/24 | 256 | ARIN | US | 29th Aug 1992 |
| 192.207.127.0/24 | 256 | ARIN | US | 29th Aug 1992 |
| 192.207.128.0/24 | 256 | ARIN | US | 29th Aug 1992 |
| 192.207.129.0/24 | 256 | ARIN | US | 29th Aug 1992 |