[Selfcommit]

Just piecing together known data here but...

My IP address requests a particular site form DNS, in theory that request could be recorded. Even if Google doesn't know that I'm at that IP (which they could have gotten from some other site I'm logged into (say Amazon)) they know that my particular ip address has requested certain sites. They can then serve ads to that IP based on context

[medde]

it is safe to assume that Google record IP information (among other things) from Google Adsense and Google Analytics... which you probably visit at least one site that use one or the other at least once a day..