You can find it by logging into your AdSense account - clicking the ‘AdSense Setup’ link and then the ‘Allowed Sites’ link.
Publishers get the choice to allow ads on any page or only selected ones. If they choose to only allow it on certain sites AdSense say the following:
“If you put your ad code on a page not on this list, ads will still show, but impressions and clicks will not be recorded.”
What’s the feature for? There’s no official announcement or word on why it’s been introduced at this point.
From what I can tell it’s a protective measure for publishers concerned that their AdSense ad code might be used on sites that they don’t authorize that could get their account into trouble. I wasn’t sure that this was a big issue - but I guess we’ll hear more about their reason to add the feature at some point soon.
