Referring URL shown for ads
For rich media ads served in a
<div>, the referring URL will be www.NameOfYourSite.com.
However, no referral URL will appear for hosted Flash, image, and AdSense ads, which are served in an iframe with no source URL.
For ads that are served through DoubleClick for Publishers iframe tags, the referring URL of the iframe will show http://pagead2.googlesyndication.com/.....