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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 167.33.0.0/16 | 65.5k | ARIN |  CA | 25th Mar 1993 |
| 167.34.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.35.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.36.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.38.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.39.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.41.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.42.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.45.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.47.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.48.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.49.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.50.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.51.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.52.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.53.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.54.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.55.0.0/16 | 65.5k | ARIN | CA | 25th Mar 1993 |
| 167.74.0.0/18 | 16.4k | ARIN | CA | 11th May 1993 |
| 167.74.64.0/20 | 4.1k | ARIN | CA | 11th May 1993 |
| 167.74.96.0/19 | 8.2k | ARIN | CA | 11th May 1993 |
| 167.88.52.0/22 | 1k | ARIN | CA | 12th Jul 2019 |
| 167.94.166.0/24 | 256 | ARIN | CA | 1st Nov 2021 |
| 167.94.170.0/23 | 512 | RIPE NCC | CA | 21st May 1993 |
| 167.94.172.0/23 | 512 | RIPE NCC | CA | 21st May 1993 |
| 168.113.224.0/22 | 1k | RIPE NCC | CA | 24th Mar 1994 |
| 168.113.231.0/24 | 256 | RIPE NCC | CA | 24th Mar 1994 |
| 168.151.17.0/24 | 256 | ARIN | CA | 16th Jan 2019 |
| 168.222.184.0/24 | 256 | RIPE NCC | CA | 12th Aug 1994 |
| 168.245.128.0/23 | 512 | ARIN | CA | 16th Jan 2018 |
| 169.128.172.0/22 | 1k | ARIN | CA | 1st Jul 2026 |
| 169.197.164.0/22 | 1k | ARIN | CA | 4th Jan 2021 |
| 170.39.100.0/24 | 256 | ARIN | CA | 3rd Oct 2024 |
| 170.39.6.0/24 | 256 | ARIN | CA | 26th Jun 2020 |
| 170.39.96.0/23 | 512 | ARIN | CA | 1st Jul 2020 |
| 170.62.162.0/24 | 256 | ARIN | CA | 15th Aug 2023 |
| 170.62.41.0/24 | 256 | ARIN | CA | 5th Feb 2024 |
| 172.82.40.0/22 | 1k | ARIN | CA | 9th Apr 2021 |
| 172.83.56.0/22 | 1k | ARIN | CA | 18th Jan 2018 |
| 172.93.80.0/20 | 4.1k | ARIN | CA | 25th Jun 2015 |
| 172.96.40.0/21 | 2k | ARIN | CA | 9th Jun 2015 |
| 172.97.60.0/22 | 1k | ARIN | CA | 12th Jun 2015 |
| 172.99.164.0/22 | 1k | ARIN | CA | 13th Jan 2021 |
| 173.214.212.0/22 | 1k | ARIN | CA | 14th Apr 2025 |
| 173.224.224.0/20 | 4.1k | ARIN | CA | 22nd Jan 2010 |
| 173.243.48.0/20 | 4.1k | ARIN | CA | 21st May 2010 |
| 173.250.0.0/17 | 32.8k | ARIN | CA | 1st Jun 2010 |
| 174.136.112.0/20 | 4.1k | ARIN | CA | 18th Nov 2010 |
| 174.136.240.0/22 | 1k | ARIN | CA | 1st Apr 2024 |
| 174.136.250.0/23 | 512 | ARIN | CA | 7th Jan 2022 |