–How? by redirecting the domain name to the localhost address these domains are effectively blocked.

127.0.0.1 localhost
127.0.0.1 207-87-18-203.wsmg.digex.net
127.0.0.1 mirror.pointroll.com
127.0.0.1 Garden.ngadcenter.net
127.0.0.1 Ogilvy.ngadcenter.net
127.0.0.1 ResponseMedia-ad.flycast.com
127.0.0.1 Suissa-ad.flycast.com
127.0.0.1 UGO.eu-adcenter.net
127.0.0.1 VNU.eu-adcenter.net
127.0.0.1 a32.g.a.yimg.com
127.0.0.1 us.a1.yimg.com
127.0.0.1 global.msads.net
127.0.0.1 ad-adex3.flycast.com
127.0.0.1 ad.adsmart.net
127.0.0.1 ad.ca.doubleclick.net
127.0.0.1 ad.de.doubleclick.net
127.0.0.1 ad.doubleclick.net
127.0.0.1 ad.fr.doubleclick.net
127.0.0.1 ad.jp.doubleclick.net
127.0.0.1 ad.linkexchange.com
127.0.0.1 ad.linksynergy.com
127.0.0.1 ad.nl.doubleclick.net
127.0.0.1 ad.no.doubleclick.net
127.0.0.1 ad.preferences.com
127.0.0.1 ad.sma.punto.net
127.0.0.1 ad.uk.doubleclick.net
127.0.0.1 ad.webprovider.com
127.0.0.1 ad08.focalink.com
127.0.0.1 adcontroller.unicast.com
127.0.0.1 adcreatives.imaginemedia.com
127.0.0.1 adex3.flycast.com
127.0.0.1 adforce.ads.imgis.com
127.0.0.1 adforce.imgis.com
127.0.0.1 adfu.blockstackers.com
127.0.0.1 adimage.blm.net
127.0.0.1 adimages.earthweb.com
127.0.0.1 adimg.egroups.com
127.0.0.1 admedia.xoom.com
127.0.0.1 adpick.switchboard.com
127.0.0.1 adremote.pathfinder.com
127.0.0.1 ads.admaximize.com
127.0.0.1 ads.bfast.com
127.0.0.1 ads.clickhouse.com
127.0.0.1 ads.enliven.com
127.0.0.1 ads.fairfax.com.au
127.0.0.1 ads.fool.com
127.0.0.1 ads.freshmeat.net
127.0.0.1 ads.hollywood.com
127.0.0.1 ads.i33.com
127.0.0.1 ads.infi.net
127.0.0.1 ads.jwtt3.com
127.0.0.1 ads.link4ads.com
127.0.0.1 ads.lycos.com
127.0.0.1 ads.madison.com
127.0.0.1 ads.mediaodyssey.com
127.0.0.1 ads.msn.com
127.0.0.1 ads.ninemsn.com.au
127.0.0.1 ads.seattletimes.com
127.0.0.1 ads.smartclicks.com
127.0.0.1 ads.smartclicks.net
127.0.0.1 ads.sptimes.com
127.0.0.1 ads.tripod.com
127.0.0.1 ads.web.aol.com
127.0.0.1 ads.x10.com
127.0.0.1 ads.xtra.co.nz
127.0.0.1 ads.zdnet.com
127.0.0.1 ads01.focalink.com
127.0.0.1 ads02.focalink.com
127.0.0.1 ads03.focalink.com
127.0.0.1 ads04.focalink.com
127.0.0.1 ads05.focalink.com
127.0.0.1 ads06.focalink.com
127.0.0.1 ads08.focalink.com
127.0.0.1 ads09.focalink.com
127.0.0.1 ads1.activeagent.at
127.0.0.1 ads10.focalink.com
127.0.0.1 ads11.focalink.com
127.0.0.1 ads12.focalink.com
127.0.0.1 ads14.focalink.com
127.0.0.1 ads16.focalink.com
127.0.0.1 ads17.focalink.com
127.0.0.1 ads18.focalink.com
127.0.0.1 ads19.focalink.com
127.0.0.1 ads2.zdnet.com
127.0.0.1 ads20.focalink.com
127.0.0.1 ads21.focalink.com
127.0.0.1 ads22.focalink.com
127.0.0.1 ads23.focalink.com
127.0.0.1 ads24.focalink.com
127.0.0.1 ads25.focalink.com
127.0.0.1 ads3.zdnet.com
127.0.0.1 ads3.zdnet.com
127.0.0.1 ads5.gamecity.net
127.0.0.1 adserv.iafrica.com
127.0.0.1 adserv.quality-channel.de
127.0.0.1 adserver.dbusiness.com
127.0.0.1 adserver.garden.com
127.0.0.1 adserver.janes.com
127.0.0.1 adserver.merc.com
127.0.0.1 adserver.monster.com
127.0.0.1 adserver.track-star.com
127.0.0.1 adserver1.ogilvy-interactive.de
127.0.0.1 adtegrity.spinbox.net
127.0.0.1 antfarm-ad.flycast.com
127.0.0.1 au.ads.link4ads.com
127.0.0.1 banner.media-system.de
127.0.0.1 banner.orb.net
127.0.0.1 banner.relcom.ru
127.0.0.1 banners.easydns.com
127.0.0.1 banners.looksmart.com
127.0.0.1 banners.wunderground.com
127.0.0.1 barnesandnoble.bfast.com
127.0.0.1 beseenad.looksmart.com
127.0.0.1 bizad.nikkeibp.co.jp
127.0.0.1 bn.bfast.com
127.0.0.1 c3.xxxcounter.com
127.0.0.1 califia.imaginemedia.com
127.0.0.1 cds.mediaplex.com
127.0.0.1 click.avenuea.com
127.0.0.1 click.go2net.com
127.0.0.1 click.linksynergy.com
127.0.0.1 clk.atdmt.com
127.0.0.1 spe.atdmt.com
127.0.0.1 cookies.cmpnet.com
127.0.0.1 cornflakes.pathfinder.com
127.0.0.1 counter.hitbox.com
127.0.0.1 crux.songline.com
127.0.0.1 erie.smartage.com
127.0.0.1 etad.telegraph.co.uk
127.0.0.1 fp.valueclick.com
127.0.0.1 gadgeteer.pdamart.com
127.0.0.1 gm.preferences.com
127.0.0.1 gp.dejanews.com
127.0.0.1 hg1.hitbox.com
127.0.0.1 image.click2net.com
127.0.0.1 image.eimg.com
127.0.0.1 images2.nytimes.com
127.0.0.1 jobkeys.ngadcenter.net
127.0.0.1 kansas.valueclick.com
127.0.0.1 leader.linkexchange.com
127.0.0.1 liquidad.narrowcastmedia.com
127.0.0.1 ln.doubleclick.net
127.0.0.1 m.doubleclick.net
127.0.0.1 macaddictads.snv.futurenet.com
127.0.0.1 maximumpcads.imaginemedia.com
127.0.0.1 media.preferences.com
127.0.0.1 mercury.rmuk.co.uk
127.0.0.1 mojofarm.sjc.mediaplex.com
127.0.0.1 nbc.adbureau.net
127.0.0.1 newads.cmpnet.com
127.0.0.1 ng3.ads.warnerbros.com
127.0.0.1 ngads.smartage.com
127.0.0.1 nsads.hotwired.com
127.0.0.1 ntbanner.digitalriver.com
127.0.0.1 ph-ad05.focalink.com
127.0.0.1 ph-ad07.focalink.com
127.0.0.1 ph-ad16.focalink.com
127.0.0.1 ph-ad17.focalink.com
127.0.0.1 ph-ad18.focalink.com
127.0.0.1 rd.yahoo.com
127.0.0.1 realads.realmedia.com
127.0.0.1 redherring.ngadcenter.net
127.0.0.1 redirect.click2net.com
127.0.0.1 regio.adlink.de
127.0.0.1 retaildirect.realmedia.com
127.0.0.1 s2.focalink.com
127.0.0.1 sh4sure-images.adbureau.net
127.0.0.1 spin.spinbox.net
127.0.0.1 static.admaximize.com
127.0.0.1 stats.superstats.com
127.0.0.1 sview.avenuea.com
127.0.0.1 thinknyc.eu-adcenter.net
127.0.0.1 tracker.clicktrade.com
127.0.0.1 tsms-ad.tsms.com
127.0.0.1 v0.extreme-dm.com
127.0.0.1 v1.extreme-dm.com
127.0.0.1 van.ads.link4ads.com
127.0.0.1 view.accendo.com
127.0.0.1 view.avenuea.com
127.0.0.1 w113.hitbox.com
127.0.0.1 w25.hitbox.com
127.0.0.1 web2.deja.com
127.0.0.1 webads.bizservers.com
127.0.0.1 http://www.PostMasterBannerNet.com
127.0.0.1 http://www.ad-up.com
127.0.0.1 http://www.admex.com
127.0.0.1 http://www.alladvantage.com
127.0.0.1 http://www.burstnet.com
127.0.0.1 http://www.commission-junction.com
127.0.0.1 http://www.eads.com
127.0.0.1 http://www.freestats.com
127.0.0.1 http://www.imaginemedia.com
127.0.0.1 http://www.netdirect.nl
127.0.0.1 http://www.oneandonlynetwork.com
127.0.0.1 http://www.targetshop.com
127.0.0.1 http://www.teknosurf2.com
127.0.0.1 http://www.teknosurf3.com
127.0.0.1 http://www.valueclick.com
127.0.0.1 http://www.websitefinancing.com
127.0.0.1 www2.burstnet.com
127.0.0.1 www4.trix.net
127.0.0.1 www80.valueclick.com
127.0.0.1 z.extreme-dm.com
127.0.0.1 z0.extreme-dm.com
127.0.0.1 z1.extreme-dm.com