Nmap scan report for dns9.quad9.net (9.9.9.9)
Host is up (0.071s latency).
Not shown: 97 filtered tcp ports (no-response)
PORT     STATE SERVICE
53/tcp   open  domain
443/tcp  open  https
8443/tcp open  https-alt

Nmap done: 1 IP address (1 host up) scanned in 3.08 seconds