Mullvad is closing its free public DNS service on 2 November 2026 and recommends Quad9 instead. Quad9 blocks malware but does not block ads or trackers. If you used one of Mullvad's filtering addresses, ads come back on that date unless you switch.
This is a companion discussion topic for the original entry at https://blokada.org/guides/switch-from-mullvad-dns/