For security purposes you should of course assume they do indefinitely. In practice I'm pretty sure every US ISP does, at least on the timescale of 30d+. I don'

For security purposes you should of course assume they do indefinitely. In practice I'm pretty sure every US ISP does, at least on the timescale of 30d+. I don't think the US officially has a retention requirement but I think Canada does. Comcast is 180 days - https://www.xfinity.com/-/media/4231839e374c4f618b2d34004d50987c https://www.xfinity.com/-/media/4231839e374c4f618b2d34004d50... I could not find a specific number for Frontier - https://content.frontier.com/-/jssmedia/documents/corporate/policies/frontier-communications-subpoena-compliance.pdf https://content.frontier.com/-/jssmedia/documents/corporate/...