# note - anything following a pound-sign is considered a comment

127.0.0.1 localhost   #your computer

#DoubleClick sites
127.0.0.1 ad.doubleclick.net
127.0.0.1 ad.doubleclick.com 
127.0.0.1 ads.doubleclick.com 
127.0.0.1 ads.doubleclick.net
127.0.0.1 www.doubleclick.net # you will not be able to browse doublclick.net if you include this line

#some other common ad sites follow:

127.0.0.1 ads.enliven.com
127.0.0.1 ads.i33.com 
127.0.0.1 .imgis.net  # you will not be able to access imgis.net if you include this line
127.0.0.1 ads.infospace.com 
127.0.0.1 ads.msn.com

127.0.0.1 Ogilvy.ngadcenter.net
127.0.0.1 image.pathfinder.com/sponsors* 
127.0.0.1 preferences.com   # you will not be able to access preferences.com if you include this line
127.0.0.1 ad.preferences.com 
127.0.0.1 sfgate.com/place-ads 
127.0.0.1 adpick.switchboard.com 
127.0.0.1 ads.switchboard.com

127.0.0.1 adbot.theonion.com 
127.0.0.1 oz.valueclick.com
127.0.0.1 ads.washingtonpost.com 
127.0.0.1 ad.washingtonpost.com 
127.0.0.1 a32.g.a.yimg.com