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So what we need is a DNS service that takes in all of the DNS record updates per normal DNS replication and flags these CNAME record entries into an easily consumable blocklist.


DNS-based filtering will be useless once DNS-over-HTTPS and pinned certificates are the norm. That will come to embedded devices first, but it'll come to consumer OS's too.


Right. But it is still possible to run a DNS resolver and dump those domains in a address based blacklist at the firewall.




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