Realizar un escaneo de puertos básico (nmap -F idsystemes.com)
Nmap scan report for idsystemes.com (185.100.4.27)
Host is up (0.17s latency).
rDNS record for 185.100.4.27: wps6002-front-pri.phpnet.org
Not shown: 96 closed ports
PORT STATE SERVICE
21/tcp open ftp
80/tcp open http
443/tcp open https
5666/tcp open nrpe
Nmap done: 1 IP address (1 host up) scanned in 5.06 seconds