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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
3,830 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 208.83.209.0/24 | 256 | ARIN |  CA | 18th Oct 2007 |
| 208.83.210.0/23 | 512 | ARIN | CA | 18th Oct 2007 |
| 208.83.213.0/24 | 256 | ARIN | CA | 18th Oct 2007 |
| 208.83.214.0/23 | 512 | ARIN | CA | 18th Oct 2007 |
| 208.84.36.0/22 | 1k | ARIN | CA | 17th Dec 2019 |
| 208.85.84.0/22 | 1k | ARIN | CA | 6th Dec 2007 |
| 208.86.206.0/23 | 512 | ARIN | CA | 31st Jan 2008 |
| 208.88.184.0/21 | 2k | ARIN | CA | 24th Mar 2008 |
| 208.92.112.0/21 | 2k | ARIN | CA | 2nd Jul 2008 |
| 208.95.172.0/22 | 1k | ARIN | CA | 25th Sept 2008 |
| 208.99.128.0/19 | 8.2k | ARIN | CA | 14th Feb 2006 |
| 209.112.64.0/22 | 1k | ARIN | CA | 26th Jun 2024 |
| 209.127.218.0/24 | 256 | ARIN | CA | 28th Apr 2022 |
| 209.135.64.0/18 | 16.4k | ARIN | CA | 22nd Dec 2000 |
| 209.142.96.0/22 | 1k | ARIN | CA | 28th Sept 2020 |
| 209.145.36.0/22 | 1k | ARIN | CA | 4th Dec 2023 |
| 209.161.96.0/21 | 2k | ARIN | CA | 29th Sept 2026 |
| 209.204.88.0/21 | 2k | ARIN | CA | 5th Aug 2026 |
| 209.205.236.0/23 | 512 | ARIN | CA | 6th Oct 2025 |
| 209.209.124.0/24 | 256 | ARIN | CA | 8th Apr 2021 |
| 209.217.121.0/24 | 256 | ARIN | CA | 30th Mar 1998 |
| 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 |
| 212.47.36.0/24 | 256 | RIPE NCC | CA | 20th Jan 2026 |
| 216.10.69.0/24 | 256 | ARIN | CA | 19th Dec 2022 |
| 216.108.162.0/23 | 512 | ARIN | CA | 9th Oct 1998 |
| 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 |
| 216.171.230.0/24 | 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 |
| 216.211.218.0/24 | 256 | ARIN | CA | 4th Apr 2023 |
| 216.221.32.0/19 | 8.2k | ARIN | CA | 7th May 1999 |
| 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 |