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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.160.44.0/24 | 256 | ARIN |  US | 4th May 1992 |
| 192.160.48.0/24 | 256 | ARIN | US | 31st Jan 2024 |
| 192.160.49.0/24 | 256 | ARIN | US | 6th May 1992 |
| 192.160.5.0/24 | 256 | ARIN | US | 21st Apr 1992 |
| 192.160.53.0/24 | 256 | ARIN | US | 6th May 1992 |
| 192.160.57.0/24 | 256 | ARIN | US | 8th May 1992 |
| 192.160.58.0/24 | 256 | ARIN | US | 8th May 1992 |
| 192.160.59.0/24 | 256 | ARIN | US | 8th May 1992 |
| 192.160.6.0/24 | 256 | ARIN | US | 21st Apr 1992 |
| 192.160.60.0/24 | 256 | ARIN | US | 8th May 1992 |
| 192.160.61.0/24 | 256 | ARIN | US | 12th May 1992 |
| 192.160.62.0/24 | 256 | ARIN | US | 12th May 1992 |
| 192.160.63.0/24 | 256 | ARIN | US | 12th May 1992 |
| 192.160.65.0/24 | 256 | RIPE NCC |  DE | 12th May 1992 |
| 192.160.67.0/24 | 256 | RIPE NCC |  AT | 12th May 1992 |
| 192.160.68.0/24 | 256 | ARIN | US | 14th May 1992 |
| 192.160.69.0/24 | 256 | ARIN | US | 14th May 1992 |
| 192.160.7.0/24 | 256 | ARIN | US | 21st Apr 1992 |
| 192.160.72.0/24 | 256 | ARIN | US | 14th May 1992 |
| 192.160.75.0/24 | 256 | ARIN | US | 15th May 1992 |
| 192.160.76.0/24 | 256 | ARIN | US | 15th May 1992 |
| 192.160.77.0/24 | 256 | ARIN | US | 15th May 1992 |
| 192.160.79.0/24 | 256 | ARIN | US | 15th May 1992 |
| 192.160.8.0/24 | 256 | ARIN | US | 21st Apr 1992 |
| 192.160.80.0/24 | 256 | ARIN | US | 15th May 1992 |
| 192.160.81.0/24 | 256 | ARIN | US | 15th May 1992 |
| 192.160.82.0/24 | 256 | ARIN | US | 15th May 1992 |
| 192.160.83.0/24 | 256 | ARIN | US | 15th May 1992 |
| 192.160.84.0/24 | 256 | ARIN | US | 15th May 1992 |
| 192.160.85.0/24 | 256 | ARIN | US | 15th May 1992 |
| 192.160.86.0/24 | 256 | ARIN | US | 15th May 1992 |
| 192.160.87.0/24 | 256 | ARIN | US | 15th May 1992 |
| 192.160.88.0/24 | 256 | ARIN | US | 15th May 1992 |
| 192.160.89.0/24 | 256 | ARIN | US | 15th May 1992 |
| 192.160.90.0/24 | 256 | ARIN | US | 15th May 1992 |
| 192.160.91.0/24 | 256 | ARIN | US | 15th May 1992 |
| 192.160.92.0/24 | 256 | ARIN | US | 15th May 1992 |
| 192.160.93.0/24 | 256 | ARIN | US | 15th May 1992 |
| 192.160.95.0/24 | 256 | RIPE NCC |  CH | 18th May 1992 |
| 192.160.96.0/24 | 256 | RIPE NCC | CH | 18th May 1992 |
| 192.161.10.0/24 | 256 | ARIN | US | 24th Apr 1992 |
| 192.161.11.0/24 | 256 | ARIN | US | 24th Apr 1992 |
| 192.161.12.0/24 | 256 | ARIN | US | 24th Apr 1992 |
| 192.161.128.0/23 | 512 | APNIC |  NZ | 4th May 1992 |
| 192.161.13.0/24 | 256 | ARIN | US | 24th Apr 1992 |
| 192.161.136.0/21 | 2k | ARIN | US | 19th Feb 2013 |
| 192.161.14.0/24 | 256 | ARIN | US | 24th Apr 1992 |
| 192.161.15.0/24 | 256 | ARIN | US | 24th Apr 1992 |
| 192.161.16.0/24 | 256 | ARIN | US | 24th Apr 1992 |
| 192.161.17.0/24 | 256 | ARIN | US | 24th Apr 1992 |