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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 209.222.76.0/24 | 256 | ARIN |  CA | 12th Nov 2015 |
| 209.50.64.0/19 | 8.2k | ARIN | CA | 22nd Dec 2000 |
| 209.62.176.0/20 | 4.1k | ARIN | CA | 6th Mar 2015 |
| 216.10.69.0/24 | 256 | ARIN | CA | 19th Dec 2022 |
| 216.108.162.0/23 | 512 | ARIN | CA | 9th Oct 1998 |
| 216.116.129.0/24 | 256 | ARIN | CA | 5th Jun 2018 |
| 216.116.136.0/22 | 1k | ARIN | CA | 3rd Oct 2024 |
| 216.126.47.0/24 | 256 | ARIN | CA | 11th Jan 2021 |
| 216.129.194.0/24 | 256 | ARIN | CA | 25th Jul 2000 |
| 216.129.211.0/24 | 256 | ARIN | CA | 25th Jul 2000 |
| 216.14.128.0/20 | 4.1k | ARIN | CA | 25th Oct 2005 |
| 216.146.12.0/22 | 1k | ARIN | CA | 11th Apr 2022 |
| 216.150.0.0/24 | 256 | ARIN | CA | 14th Jul 1999 |
| 216.150.2.0/23 | 512 | ARIN | CA | 14th Jul 1999 |
| 216.150.20.0/23 | 512 | ARIN | CA | 14th Jul 1999 |
| 216.151.35.0/24 | 256 | ARIN | CA | 3rd Jan 2017 |
| 216.157.0.0/24 | 256 | ARIN | CA | 16th Dec 1998 |
| 216.162.64.0/20 | 4.1k | ARIN | CA | 30th Jul 1999 |
| 216.171.225.0/24 | 256 | ARIN | CA | 10th Jun 2002 |
| 216.171.228.0/23 | 512 | ARIN | CA | 10th Jun 2002 |
| 216.171.230.0/24 | 256 | ARIN | CA | 10th Jun 2002 |
| 216.171.236.0/24 | 256 | ARIN | CA | 10th Jun 2002 |
| 216.171.238.0/23 | 512 | ARIN | CA | 10th Jun 2002 |
| 216.183.0.0/19 | 8.2k | ARIN | CA | 22nd Dec 2000 |
| 216.20.208.0/20 | 4.1k | ARIN | CA | 11th Jan 2019 |
| 216.211.199.0/24 | 256 | ARIN | CA | 14th Apr 2023 |
| 216.221.32.0/19 | 8.2k | ARIN | CA | 7th May 1999 |
| 216.238.36.0/22 | 1k | ARIN | CA | 2nd Jul 2025 |
| 216.240.0.0/20 | 4.1k | ARIN | CA | 16th Sept 1999 |
| 216.241.224.0/20 | 4.1k | ARIN | CA | 17th Nov 1999 |
| 216.246.224.0/19 | 8.2k | ARIN | CA | 31st Oct 2005 |
| 216.25.16.0/22 | 1k | ARIN | CA | 28th Jul 1998 |
| 216.252.212.0/22 | 1k | ARIN | CA | 4th May 2015 |
| 216.38.236.0/22 | 1k | ARIN | CA | 1st Apr 2024 |
| 216.52.222.0/24 | 256 | ARIN | CA | 16th Jul 2026 |
| 216.7.192.0/19 | 8.2k | ARIN | CA | 7th Feb 2001 |
| 216.87.222.0/24 | 256 | ARIN | CA | 13th Aug 1999 |
| 216.99.96.0/20 | 4.1k | ARIN | CA | 28th Oct 1998 |
| 217.119.130.0/24 | 256 | RIPE NCC | CA | 5th Oct 2021 |
| 23.128.82.0/24 | 256 | ARIN | CA | 10th Nov 2021 |
| 23.132.248.0/24 | 256 | ARIN | CA | 3rd Mar 2022 |
| 23.133.168.0/24 | 256 | ARIN | CA | 17th Mar 2022 |
| 23.134.48.0/24 | 256 | ARIN | CA | 14th May 2019 |
| 23.139.144.0/24 | 256 | ARIN | CA | 30th Jul 2019 |
| 23.139.152.0/24 | 256 | ARIN | CA | 3rd Aug 2022 |
| 23.139.16.0/24 | 256 | ARIN | CA | 24th Jul 2019 |
| 23.139.208.0/24 | 256 | ARIN | CA | 5th Aug 2019 |
| 23.140.52.0/24 | 256 | ARIN | CA | 13th Jun 2025 |
| 23.143.112.0/24 | 256 | ARIN | CA | 15th Oct 2019 |
| 23.143.60.0/24 | 256 | ARIN | CA | 1st Aug 2025 |