Performing a basic port scan (nmap -F improntus.com)
Nmap scan report for improntus.com (104.21.25.253)
Host is up (0.00086s latency).
Other addresses for improntus.com (not scanned): 2606:4700:3031::6815:19fd 2606:4700:3032::ac43:86f6 172.67.134.246
Not shown: 96 filtered tcp ports (no-response)
PORT STATE SERVICE
80/tcp open http
443/tcp open https
8080/tcp open http-proxy
8443/tcp open https-alt
Nmap done: 1 IP address (1 host up) scanned in 2.05 seconds