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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through ARIN, largest first.
Unannounced blocks in Canada
3,775 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 198.102.174.0/24 | 256 | ARIN | CA | 29th Mar 1993 |
| 198.133.162.0/23 | 512 | ARIN | CA | 21st Apr 1993 |
| 198.133.164.0/24 | 256 | ARIN | CA | 21st Apr 1993 |
| 198.133.231.0/24 | 256 | ARIN | CA | 30th Apr 1993 |
| 198.133.64.0/21 | 2k | ARIN | CA | 31st Mar 1993 |
| 198.133.72.0/24 | 256 | ARIN | CA | 31st Mar 1993 |
| 198.134.219.0/24 | 256 | ARIN | CA | 10th May 1993 |
| 198.135.126.0/24 | 256 | ARIN | CA | 4th Oct 2021 |
| 198.135.72.0/24 | 256 | ARIN | CA | 11th May 1993 |
| 198.140.151.0/24 | 256 | ARIN | CA | 30th Jun 1993 |
| 198.153.216.0/24 | 256 | ARIN | CA | 2nd Jul 2026 |
| 198.153.217.0/24 | 256 | ARIN | CA | 2nd Jul 2026 |
| 198.154.28.0/23 | 512 | ARIN | CA | 9th Sept 2025 |
| 198.154.7.0/24 | 256 | ARIN | CA | 28th Oct 2013 |
| 198.16.25.0/24 | 256 | ARIN | CA | 24th Oct 2012 |
| 198.161.1.0/24 | 256 | ARIN | CA | 19th May 1993 |
| 198.161.118.0/24 | 256 | ARIN | CA | 24th Jan 1994 |
| 198.161.124.0/24 | 256 | ARIN | CA | 7th Feb 1994 |
| 198.161.125.0/24 | 256 | ARIN | CA | 25th Feb 1994 |