Here a list of DNS request for ad-trackers, that you could get using an unprotected browser without uMatrix and uBlock Origin.
All neatly blocked for me were:
-vendorlist.consensu.org
-logs.choice.faktor.io
-js-sec.indexww.com
-adservice.google.com
-dns-gigya.com
-static.criteo.net
-secure.adnx.com
-bidder.criteo.com
-cdns.eur.gigya.com
static.chartbeat.com
-static.hotjar.com
-ns-1117.awsdns-11.org
-invitation.opinionbar.com
-cmp-loader.choice.faktor.io
-Z.moatads.com
-track.adform.net
frai-lib.adnx.com
-cdn.krxd.net
-ad.yieldlab.net
-tokenrubiconproject.com
-pixel.advertising.com
-ih.adscale.de
-ads.stickyadstv.com
-x.bidswitch.net
-loadm.exelator.com
-tags.bluekai.com
-pixel.onaudience.com
-s-amazon-adsystem.com
-dpm.demelex.net
-d.turn.com
-e.nexac.com
-tapestry.tapad.com
One could also get a good idea of what ad-tracking and monitoring goes on under the browser-hood .
polonus