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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.189.30.0/24 | 256 | ARIN |  US | 18th Jun 1992 |
| 192.189.31.0/24 | 256 | ARIN | US | 18th Jun 1992 |
| 192.189.32.0/24 | 256 | ARIN | US | 18th Jun 1992 |
| 192.189.33.0/24 | 256 | ARIN | US | 18th Jun 1992 |
| 192.189.34.0/24 | 256 | APNIC |  NZ | 18th Jun 1992 |
| 192.189.35.0/24 | 256 | ARIN | US | 18th Jun 1992 |
| 192.189.41.0/24 | 256 | RIPE NCC |  GB | 30th Jun 1992 |
| 192.189.43.0/24 | 256 | ARIN | US | 30th Jun 1992 |
| 192.189.44.0/24 | 256 | ARIN | US | 30th Jun 1992 |
| 192.189.49.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 192.189.50.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 192.189.52.0/24 | 256 | RIPE NCC | GB | 1st Sept 1993 |
| 192.189.53.0/24 | 256 | ARIN | US | 1st Jul 1992 |
| 192.189.55.0/24 | 256 | RIPE NCC | GB | 1st Jul 1992 |
| 192.189.56.0/24 | 256 | ARIN | US | 1st Jul 1992 |
| 192.189.57.0/24 | 256 | ARIN | US | 1st Jul 1992 |
| 192.189.59.0/24 | 256 | ARIN | US | 30th Jul 2015 |
| 192.189.61.0/24 | 256 | ARIN | US | 9th Jul 1992 |
| 192.189.62.0/24 | 256 | ARIN | US | 9th Jul 1992 |
| 192.189.63.0/24 | 256 | ARIN | US | 9th Jul 1992 |
| 192.189.64.0/24 | 256 | ARIN | US | 9th Jul 1992 |
| 192.189.66.0/24 | 256 | RIPE NCC |  FR | 9th Jul 1992 |
| 192.189.67.0/24 | 256 | ARIN |  CA | 10th Jul 1992 |
| 192.189.68.0/24 | 256 | ARIN | CA | 10th Jul 1992 |
| 192.189.69.0/24 | 256 | RIPE NCC | GB | 1st Sept 1993 |
| 192.189.7.0/24 | 256 | ARIN | US | 17th Jun 1992 |
| 192.189.70.0/24 | 256 | RIPE NCC |  IL | 10th Jul 1992 |
| 192.189.73.0/24 | 256 | RIPE NCC |  NL | 10th Jul 1992 |
| 192.189.74.0/24 | 256 | ARIN | US | 18th May 1995 |
| 192.189.75.0/24 | 256 | AFRINIC |  ZA | 10th Jul 1992 |
| 192.189.76.0/24 | 256 | RIPE NCC |  DE | 10th Jul 1992 |
| 192.189.77.0/24 | 256 | ARIN | US | 10th Jul 1992 |
| 192.189.79.0/24 | 256 | ARIN | US | 10th Jul 1992 |
| 192.189.8.0/24 | 256 | RIPE NCC | GB | 17th Jun 1992 |
| 192.189.80.0/24 | 256 | ARIN | US | 10th Jul 1992 |
| 192.189.83.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.84.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.86.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 192.189.87.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 192.189.88.0/24 | 256 | ARIN | US | 1st Jul 2026 |
| 192.189.9.0/24 | 256 | RIPE NCC | GB | 17th Jun 1992 |
| 192.189.91.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.92.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.93.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.189.95.0/24 | 256 | ARIN |  PR | 13th Jul 1992 |
| 192.189.98.0/24 | 256 | ARIN | US | 13th Jul 1992 |
| 192.190.10.0/24 | 256 | ARIN | US | 17th Feb 1993 |
| 192.190.101.0/24 | 256 | ARIN | US | 24th Jun 1992 |
| 192.190.102.0/24 | 256 | ARIN | US | 24th Jun 1992 |
| 192.190.103.0/24 | 256 | ARIN | US | 24th Jun 1992 |