XF 2.1 How can you stop the same IP from creating more than one account?

How would that work if new registrations were coming from a proxy server or as you find with many mobile services, a dynamic IP address?
I'm not looking for a comprehensive way of protecting against all methods of creating sock puppets, and I doubt that it exists, just any simple tool that would mitigate the most basic and common attempts to do so.
 
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