Realizar un escaneo de puertos básico (nmap -F 173.239.21.197)
Nmap scan report for 173.239.21.197
Host is up (0.065s latency).
Not shown: 99 filtered tcp ports (no-response)
PORT STATE SERVICE
443/tcp open https
Nmap done: 1 IP address (1 host up) scanned in 4.90 seconds