I don't think it's possible, because of domain fronting. 
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For example, I don't think there's anyway to detect this without also blocking google: curl -s -H 'Host: http://dns.google.com ' 'https://www.google.com/resolve?name=example … .com&type=A'
2 replies 2 retweets 6 likes -
Replying to @da_667
Hmm, I don't think dns queries over http are support though - it's a https only protocol
1 reply 0 retweets 3 likes
Replying to @da_667
Ahh, you're on a network where you can install a CA on endpoints and have some https middleware box? In that case, yes, you can totally block it - I thought you were just trying to detect it at the network level 
1:10 PM - 2 Jul 2019
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