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    f :: IPAddress -> [Maybe EmailAddress]
I am guessing that in order to get this function to work, the ad company would have a contract with a company such as LinkedIn or Twitter, who can perform this mapping, based on their server logs.


IP address alone isn't sufficent, browser info is also needed


Which would be quite vile.


And probably illegal.


That data is guaranteed to be public, per the rules governing the domain name registration system.




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