What's the most reliable way to detect if the user is logging in from a different device than usual?

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I suspect we're all familiar with how facebook and google and the like detect if you're using a different device than usual, I was wondering what the most reliable way to do this is?

I'm talking about the old 'It looks like you're signing in from a different device', and then when you confirm etc, it usually sends you an email and asks whether you want to trust this device or not.

Obviously one could just set a cookie, one that maybe get's checked and logged each visit, but what about when the user signs out? Do we keep the cookie?

Is there any other reliable method to 'trust' a 'device' other than setting cookies? Or is this the best/most reliable way to do it?

asked 50 secs ago

Harry Mustoe-Playfair
489

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What's the most reliable way to detect if the user is logging in from a different device than usual?