If you’re an AdSense publisher who is worried that your AdSense code is being used on shady or objectionable websites then you can do something about it now. If you haven’t noticed already, there is an option called “allowed sites” under “AdSense setup” tab in your dashboard. This feature basically lets you create a list of sites that are allowed to display your AdSense ads. If you use this feature then any site that is not on the list can still display your ads but page impressions and clicks won’t be counted thus making the ad units useless on those sites. It’s a good feature to protect your account from unauthorized use, which (unauthorized use of your ad unit) could potentially get you in trouble with Google for any AdSense terms or policy violation.
To add sites to your allowed sites list, click on ADSENSE SETUP tab and then go to ALLOWED SITES option. Just add the domains/sub-domains in the box and click SAVE CHANGES. It could take anywhere between 4 hours to 48 hours for changes to be effective. You can get more details about this option on AdSense help section.
Click on AdSense Setup tab
Select Allowed Sites

Add your domains in the format shown above
There are some trade offs if you use this feature. Since, any site that is not on the list will not able to generate any revenue so you might potentially lose some income from websites that display external site content within their sites and cache sites, proxy sites, translation sites etc. It all depends on your situation and your traffic source. So, use this feature at your own discretion.
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