Dns test 443 v4
DoH
If you entered http://encrypted-dns-tester.aa.net.uk in to your browser and landed on this page, then your DNS lookup was via DoH and you can to this web site over IPv4
If you entered http://encrypted-dns-tester.aa.net.uk in to your browser and landed on this page, then your DNS lookup was via DoH and you can to this web site over IPv4