https://raw.githubusercontent.com/nickspaargaren/pihole-google/master/categories/doubleclick.txt

Domains that are included;

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ad.jp.doubleclick.net
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creatives.doubleclick.net
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doubleclick.de
doubleclick.ne.jp
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feedads.g.doubleclick.net
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vodads.g.doubleclick.net
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www3.doubleclick.com
www3.doubleclick.net