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

Domains that are not included;

ad.doubleclick.net
dart.l.doubleclick.net
doubleclick.com
doubleclick.net
gan.doubleclick.net
l.doubleclick.net
pagead.l.doubleclick.net
pagead46.l.doubleclick.net
www3.doubleclick.net