Mullvad DNS · NextDNS
What it's for
Two encrypted resolvers that also block ads and trackers for the whole device.
Why it matters
Mullvad DNS (Sweden, no-log) is free and offers blocklists. NextDNS is highly customisable, with a dashboard and per-device profiles, but it’s US-based and logs by default (turn it off in settings).
For whom & when
Those who want system-wide ad-blocking without installing a per-browser extension.
Install & use
Mullvad DNS: use the address shown at mullvad.net/help/dns as your private DNS (same method as Quad9).
NextDNS: create a profile at nextdns.io, disable logging, then apply the config to your devices.