AdGuard on Thursday published a list of more than 6,000 CNAME-based trackers so they can be incorporated into content-blocking filters.
CNAME tracking is a way to configure DNS records to erase the distinction between code and assets from a publisher's (first-party) domain and tracking scripts on that site that call a server on an advertiser's (third-party) domain. Such domain cloaking – obscuring who controls a domain – undoes privacy defenses, like the blocking of third-party cookies, by making third-party assets look like they're associated with the first-party domain.
As privacy barriers have gone up to prevent marketers from gathering data from web users, CNAME manipulation has become more popular. As we reported last week, privacy researchers recently found that the presence of CNAM ..
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