/> @example.org

.._auth IN TXT 

http://example.org/.txt

: openssl req -newkey rsa:4096 -subj "/CN=example.org/OU=" -nodes -out myCSR -keyout myKey
openssl x509 -req -in myCSR -signkey myKey -out myCert -extfile <(printf 'extendedKeyUsage = serverAuth\n')

>

Port: