Google AdX / DoubleClick

(securepubads.g.doubleclick.net, g.doubleclick.net)

Mantis Intelligence (Reach PLC’s internal SSP)

(mantis-intelligence.com, mantishydra.mantis-awx.com)

Amazon Publisher Services (APS)

Indirectly referenced via Reach’s header bidding setup

(APS endpoints often hidden behind script loaders)

Index Exchange

Reach PLC uses Index; your log shows related telemetry endpoints

OpenX

Not directly visible in your log, but Reach PLC’s header bidding config includes OpenX

PubMatic

Same as above — part of Reach PLC’s standard bidder chain

Magnite (Rubicon Project)

Also part of Reach PLC’s standard bidder chain

These are typically loaded dynamically via Google Tag Manager or Prebid.js:

  • Xandr (Microsoft)
  • TripleLift
  • Yahoo Exchange

A website, for example may use Prebid.js, which loads bidders dynamically — meaning the actual exchanges are often hidden behind script bundles.

Which of these Brave blocks

Brave blocks third‑party trackers, but notfirst‑party telemetry.

Here’s the breakdown:

Exchange / Tracker Brave Blocks? Why

Google AdX / DoubleClick YesKnown cross‑site trackerIndex Exchange MostlyBlocklists catch most endpointsOpenX YesKnown trackerPubMatic YesKnown trackerMagnite YesKnown trackerXandrYesKnown trackerTripleLift YesKnown trackerYahoo DSP MostlySome endpoints slip throughAmazon Publisher Services PartiallyAPS uses server‑side biddingMantis Intelligence (Reach PLC) NoFirst‑party to DailyRecordA blocklist that kills RTB entirely

Here’s a clean, surgical blocklist that shuts down RTB at the root.

You can paste this into:

  • Pi‑hole
  • NextDNS
  • AdGuard Home
  • uBlock Origin Lite –> (My Filters)

Core RTB Kill List

Code

doubleclick.net
googlesyndication.com
googleadservices.com
g.doubleclick.net
securepubads.g.doubleclick.net
adnxs.com
appnexus.com
rubiconproject.com
pubmatic.com
openx.net
openx.com
indexww.com
criteo.com
criteo.net
adsrvr.org
serving-sys.com
mathtag.com
yieldmo.com
taboola.com
outbrain.com

Each bidder uses the fingerprint to:

  • identify you
  • match you to previous browsing
  • determine your interests
  • estimate your value
  • decide how much to bid

Even losing bidders keep the fingerprint

This is the part regulators hate.

You don’t just share your fingerprint with the winner —

you share it with every bidder.

A single page load can broadcast your fingerprint to 50–200 companies.

Fingerprints are stored and cross‑referenced

Ad‑tech companies build:

  • behavioral profiles
  • interest graphs
  • demographic predictions
  • purchase intent models

All without cookies.