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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
3,800 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.253.96.0/22 | 1k | ARIN |  CA | 29th Mar 2017 |
| 104.153.167.0/24 | 256 | ARIN | CA | 15th Feb 2018 |
| 104.160.230.0/24 | 256 | ARIN | CA | 4th Sept 2019 |
| 104.192.144.0/22 | 1k | ARIN | CA | 5th Sept 2014 |
| 104.192.152.0/22 | 1k | ARIN | CA | 5th Sept 2014 |
| 104.192.172.0/22 | 1k | ARIN | CA | 8th Sept 2014 |
| 104.193.208.0/22 | 1k | ARIN | CA | 25th Sept 2014 |
| 104.193.92.0/22 | 1k | ARIN | CA | 18th Sept 2014 |
| 104.218.238.0/24 | 256 | ARIN | CA | 21st Apr 2023 |
| 104.219.100.0/22 | 1k | ARIN | CA | 22nd Oct 2014 |
| 104.219.188.0/22 | 1k | ARIN | CA | 29th Oct 2014 |
| 104.224.24.0/22 | 1k | ARIN | CA | 4th Jan 2021 |
| 104.232.12.0/22 | 1k | ARIN | CA | 17th Dec 2019 |
| 104.245.160.0/21 | 2k | ARIN | CA | 10th Dec 2014 |
| 104.247.96.0/24 | 256 | ARIN | CA | 6th Jul 2026 |
| 104.37.240.0/22 | 1k | ARIN | CA | 7th Jul 2014 |
| 107.161.152.0/24 | 256 | ARIN | CA | 17th Sept 2018 |
| 107.161.33.0/24 | 256 | ARIN | CA | 9th Jan 2014 |
| 108.175.128.0/20 | 4.1k | ARIN | CA | 27th Feb 2012 |
| 114.69.241.0/24 | 256 | ARIN | CA | 18th Nov 2024 |
| 128.254.196.0/22 | 1k | ARIN | CA | 4th Oct 2022 |
| 130.12.110.0/24 | 256 | ARIN | CA | 8th Oct 2025 |
| 130.12.188.0/24 | 256 | ARIN | CA | 8th Dec 2025 |
| 130.12.249.0/24 | 256 | ARIN | CA | 24th Dec 2025 |
| 130.12.62.0/24 | 256 | ARIN | CA | 8th Oct 2025 |
| 130.12.89.0/24 | 256 | ARIN | CA | 13th Oct 2025 |
| 130.51.111.0/24 | 256 | ARIN | CA | 2nd Apr 2024 |
| 130.51.16.0/22 | 1k | ARIN | CA | 12th Mar 2021 |
| 131.133.0.0/16 | 65.5k | ARIN | CA | 19th Jul 1989 |
| 131.140.0.0/15 | 131k | ARIN | CA | 21st Nov 1988 |
| 131.143.58.0/24 | 256 | ARIN | CA | 7th Oct 2025 |
| 131.143.82.0/24 | 256 | ARIN | CA | 17th Oct 2025 |
| 131.162.240.0/20 | 4.1k | ARIN | CA | 9th Dec 1988 |
| 131.195.0.0/16 | 65.5k | ARIN | CA | 6th Jan 1989 |
| 131.235.0.0/16 | 65.5k | ARIN | CA | 31st Jan 1989 |
| 132.202.0.0/16 | 65.5k | ARIN | CA | 31st May 1989 |
| 134.195.151.0/24 | 256 | ARIN | CA | 20th Oct 2025 |
| 134.195.164.0/22 | 1k | ARIN | CA | 10th Jul 2020 |
| 134.195.168.0/24 | 256 | ARIN | CA | 14th Jul 2020 |
| 134.195.188.0/22 | 1k | ARIN | CA | 30th Sept 2025 |
| 134.199.36.0/23 | 512 | ARIN | CA | 13th Jul 1989 |
| 134.199.45.0/24 | 256 | ARIN | CA | 13th Jul 1989 |
| 134.49.232.0/21 | 2k | RIPE NCC | CA | 26th Apr 1989 |
| 135.84.16.0/20 | 4.1k | ARIN | CA | 23rd Jul 2018 |
| 136.175.132.0/22 | 1k | ARIN | CA | 29th Sept 2020 |
| 136.175.148.0/22 | 1k | ARIN | CA | 2nd Oct 2020 |
| 136.175.212.0/24 | 256 | ARIN | CA | 6th Oct 2025 |
| 136.175.44.0/22 | 1k | ARIN | CA | 29th Sept 2020 |
| 137.83.31.0/24 | 256 | ARIN | CA | 8th May 2019 |
| 138.10.0.0/16 | 65.5k | ARIN | CA | 6th Dec 1989 |