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CRTC cyber security blocking in Canada

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CRTC cyber security blocking

Also called: Network-level blocking, Botnet blocking

CRTC decision (opens in a new tab)
  1. Since August 2025, Canadian carriers can block known malicious domains and IP addresses on their networks.
  2. It’s on by default and you can’t opt out. Changing DNS may not help, since some providers also block by IP.
  3. Safe site blocked? Report a false positive to your provider. Find the number on its Cyber Security Blocking page. They must deal with it within two business days.