Performing a basic port scan (nmap -F calendarmine.com)
Nmap scan report for calendarmine.com (159.253.222.101)
Host is up (0.16s latency).
Not shown: 95 filtered ports
PORT STATE SERVICE
21/tcp open ftp
25/tcp open smtp
53/tcp open domain
80/tcp open http
443/tcp closed https
Nmap done: 1 IP address (1 host up) scanned in 4.32 seconds