I’d say nowadays 443/tcp is the only port that you’ll find open in any usable network, anything else is part of a corporate network whack-a-mole game. So while

I’d say nowadays 443/tcp is the only port that you’ll find open in any usable network, anything else is part of a corporate network whack-a-mole game. So while DoH and DoT traffic shouldn’t be distinguishable, 853/tcp is surely a weird port in the grand scheme of things.