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Blackhole 8.8.8.8, 8.4.4.8, 1.1.1.1, and 1.0.0.1.

Technically, the provider could use something else, but are they so worried about ad blocking that they’ll run BGP anycast themselves?

Add 9.9.9.9, and the other IP. Besides 4.2.2.2 and 4.2.2.1. Also the IPv6 equivalents. There's almost an infinite number of DNS servers.