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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in Canada
3,819 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.75.75.0/24 | 256 | ARIN |  CA | 5th Feb 1991 |
| 192.75.76.0/24 | 256 | ARIN | CA | 5th Feb 1991 |
| 192.75.77.0/24 | 256 | ARIN | CA | 5th Feb 1991 |
| 192.75.78.0/24 | 256 | ARIN | CA | 5th Feb 1991 |
| 192.75.79.0/24 | 256 | ARIN | CA | 5th Feb 1991 |
| 192.75.8.0/24 | 256 | ARIN | CA | 26th Mar 1990 |
| 192.75.81.0/24 | 256 | ARIN | CA | 18th Mar 1991 |
| 192.75.82.0/23 | 512 | ARIN | CA | 18th Mar 1991 |
| 192.75.84.0/22 | 1k | ARIN | CA | 18th Mar 1991 |
| 192.75.9.0/24 | 256 | ARIN | CA | 26th Mar 1990 |
| 192.75.91.0/24 | 256 | ARIN | CA | 18th Mar 1991 |
| 192.75.92.0/24 | 256 | ARIN | CA | 18th Mar 1991 |
| 192.75.93.0/24 | 256 | ARIN | CA | 18th Mar 1991 |
| 192.75.98.0/24 | 256 | ARIN | CA | 9th Apr 1991 |
| 192.77.47.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.48.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.52.0/24 | 256 | ARIN | CA | 29th Oct 1992 |
| 192.77.53.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.54.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.55.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.56.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.57.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.58.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.59.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.60.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.61.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.62.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.64.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.65.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.66.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.67.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.68.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.73.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.74.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.77.75.0/24 | 256 | ARIN | CA | 6th Nov 1990 |
| 192.78.248.0/21 | 2k | ARIN | CA | 1st Jun 1990 |
| 192.78.48.0/20 | 4.1k | ARIN | CA | 3rd Oct 1989 |
| 192.82.117.0/24 | 256 | ARIN | CA | 16th Jul 1990 |
| 192.83.101.0/24 | 256 | ARIN | CA | 7th Sept 1990 |
| 192.83.121.0/24 | 256 | ARIN | CA | 17th Sept 1990 |
| 192.83.247.0/24 | 256 | ARIN | CA | 8th Oct 1990 |
| 192.91.210.0/24 | 256 | ARIN | CA | 18th Jan 1991 |
| 192.92.99.0/24 | 256 | ARIN | CA | 5th Mar 2025 |
| 192.94.40.0/24 | 256 | ARIN | CA | 12th Feb 1991 |
| 192.94.49.0/24 | 256 | ARIN | CA | 6th Feb 2015 |
| 192.94.54.0/24 | 256 | ARIN | CA | 15th Feb 1991 |
| 192.96.78.0/24 | 256 | ARIN | CA | 18th Feb 2015 |
| 193.17.88.0/24 | 256 | RIPE NCC | CA | 14th Sept 2021 |
| 193.28.239.0/24 | 256 | RIPE NCC | CA | 26th May 2020 |
| 193.31.12.0/24 | 256 | RIPE NCC | CA | 7th Oct 2019 |