Realizar un escaneo de puertos básico (nmap -F curacat.de)
Nmap scan report for curacat.de (185.60.198.5)
Host is up (0.16s latency).
Not shown: 99 filtered tcp ports (no-response)
PORT STATE SERVICE
25/tcp open smtp
Nmap done: 1 IP address (1 host up) scanned in 5.26 seconds