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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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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 |
|---|---|---|---|---|
| 208.70.0.0/21 | 2k | ARIN |  CA | 28th Aug 2006 |
| 208.73.156.0/22 | 1k | ARIN | CA | 2nd Apr 2026 |
| 208.75.188.0/22 | 1k | ARIN | CA | 5th Mar 2007 |
| 208.81.144.0/22 | 1k | ARIN | CA | 17th Aug 2007 |
| 208.81.186.0/23 | 512 | ARIN | CA | 27th Oct 2022 |
| 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 |
| 208.90.232.0/22 | 1k | ARIN | CA | 20th May 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 |
| 209.127.62.0/24 | 256 | ARIN | CA | 12th Jan 2018 |
| 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 |
| 209.204.88.0/21 | 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 |
| 209.222.48.0/20 | 4.1k | ARIN | CA | 12th Apr 2005 |
| 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 |