Realizar un escaneo de puertos básico (nmap -F olsten.com)
Nmap scan report for olsten.com (20.49.104.4)
Host is up (0.059s latency).
Not shown: 98 filtered ports
PORT STATE SERVICE
80/tcp open http
443/tcp open https
Nmap done: 1 IP address (1 host up) scanned in 5.18 seconds