Realizar un escaneo de puertos básico (nmap -F fedex.com)
Nmap scan report for fedex.com (204.135.13.155)
Host is up (0.046s latency).
Other addresses for fedex.com (not scanned): 204.135.8.50 204.135.13.175 204.135.8.175 204.135.13.50 204.135.8.155
rDNS record for 204.135.13.155: www-vip18.dmz.fedex.com
Not shown: 97 filtered ports
PORT STATE SERVICE
80/tcp open http
443/tcp open https
8443/tcp closed https-alt
Nmap done: 1 IP address (1 host up) scanned in 11.88 seconds