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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.190.238.0/24 | 256 | ARIN |  US | 8th Jul 1992 |
| 192.190.242.0/24 | 256 | RIPE NCC |  FR | 8th Jul 1992 |
| 192.190.247.0/24 | 256 | RIPE NCC |  GB | 8th Jul 1992 |
| 192.190.248.0/24 | 256 | RIPE NCC | GB | 8th Jul 1992 |
| 192.190.249.0/24 | 256 | RIPE NCC | GB | 8th Jul 1992 |
| 192.190.25.0/24 | 256 | ARIN |  CA | 31st Jul 2020 |
| 192.190.250.0/24 | 256 | ARIN | US | 8th Jul 1992 |
| 192.190.251.0/24 | 256 | ARIN | US | 8th Jul 1992 |
| 192.190.3.0/24 | 256 | ARIN | US | 1st Sept 1992 |
| 192.190.33.0/24 | 256 | ARIN | US | 17th Jun 1992 |
| 192.190.34.0/23 | 512 | ARIN | US | 17th Jun 1992 |
| 192.190.36.0/24 | 256 | ARIN | US | 17th Jun 1992 |
| 192.190.39.0/24 | 256 | ARIN | US | 17th Jun 1992 |
| 192.190.4.0/24 | 256 | ARIN | US | 18th Sept 1992 |
| 192.190.41.0/24 | 256 | ARIN | US | 17th Jun 1992 |
| 192.190.44.0/24 | 256 | RIPE NCC | GB | 17th Jun 1992 |
| 192.190.46.0/24 | 256 | ARIN | US | 17th Jun 1992 |
| 192.190.48.0/24 | 256 | ARIN | US | 18th Jun 1992 |
| 192.190.5.0/24 | 256 | ARIN | US | 18th Sept 1992 |
| 192.190.50.0/24 | 256 | ARIN | US | 18th Jun 1992 |
| 192.190.51.0/24 | 256 | ARIN | US | 18th Jun 1992 |
| 192.190.52.0/24 | 256 | ARIN | US | 18th Jun 1992 |
| 192.190.53.0/24 | 256 | ARIN | US | 18th Jun 1992 |
| 192.190.54.0/24 | 256 | ARIN | US | 18th Jun 1992 |
| 192.190.58.0/24 | 256 | RIPE NCC |  NO | 18th Jun 1992 |
| 192.190.59.0/24 | 256 | RIPE NCC | NO | 18th Jun 1992 |
| 192.190.6.0/24 | 256 | ARIN | US | 22nd Oct 1993 |
| 192.190.62.0/24 | 256 | ARIN | US | 18th Jun 1992 |
| 192.190.63.0/24 | 256 | ARIN | US | 19th Jun 1992 |
| 192.190.64.0/24 | 256 | RIPE NCC | GB | 19th Jun 1992 |
| 192.190.65.0/24 | 256 | ARIN | US | 19th Jun 1992 |
| 192.190.66.0/24 | 256 | APNIC |  AU | 19th Jun 1992 |
| 192.190.67.0/24 | 256 | RIPE NCC | GB | 19th Jun 1992 |
| 192.190.68.0/24 | 256 | ARIN | US | 19th Jun 1992 |
| 192.190.69.0/24 | 256 | RIPE NCC | FR | 19th Jun 1992 |
| 192.190.71.0/24 | 256 | ARIN | US | 19th Jun 1992 |
| 192.190.72.0/24 | 256 | ARIN | US | 19th Jun 1992 |
| 192.190.73.0/24 | 256 | ARIN | US | 22nd Jun 1992 |
| 192.190.74.0/24 | 256 | ARIN | US | 22nd Jun 1992 |
| 192.190.77.0/24 | 256 | ARIN | US | 22nd Jun 1992 |
| 192.190.78.0/24 | 256 | ARIN | US | 24th Feb 1993 |
| 192.190.79.0/24 | 256 | ARIN | US | 27th Nov 1992 |
| 192.190.9.0/24 | 256 | ARIN | US | 25th Sept 1992 |
| 192.190.92.0/23 | 512 | ARIN | US | 2nd Apr 2015 |
| 192.190.95.0/24 | 256 | RIPE NCC | NO | 22nd Jun 1992 |
| 192.190.96.0/24 | 256 | ARIN | US | 22nd Jun 1992 |
| 192.190.97.0/24 | 256 | ARIN | US | 22nd Jun 1992 |
| 192.190.98.0/24 | 256 | ARIN | US | 24th Jun 1992 |
| 192.191.0.0/16 | 65.5k | ARIN | US | 1st Jul 1992 |
| 192.195.1.0/24 | 256 | RIPE NCC | GB | 8th Jul 1992 |