Nmap scan report for ack.nmap.org (50.116.1.184)
Host is up (0.22s latency).
Not shown: 95 filtered tcp ports (no-response)
PORT    STATE  SERVICE
22/tcp  open   ssh
25/tcp  open   smtp
80/tcp  open   http
113/tcp closed ident
443/tcp open   https

Nmap done: 1 IP address (1 host up) scanned in 5.10 seconds