Realizar un escaneo de puertos básico (nmap -F google.com)
Nmap scan report for google.com (172.217.12.142)
Host is up (0.00036s latency).
Other addresses for google.com (not scanned): 2607:f8b0:4007:801::200e
rDNS record for 172.217.12.142: lga34s19-in-f14.1e100.net
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 5.88 seconds