5 `nmap` is designed to allow system administrators to scan large
6 networks to determine which hosts are up and what services they
7 offer. You can use nmap to test your firewall settings, for example
8 to see if the required ports are open.
10 .Test Razor port (tcp port 2703):
12 # nmap -P0 -sS -p 2703 c301.cloudmark.com
13 Starting Nmap 7.70 ( https://nmap.org ) at 2020-04-14 12:20 CEST
14 Nmap scan report for c301.cloudmark.com (208.83.137.114)
15 Host is up (0.13s latency).
18 2703/tcp open sms-chat
20 Nmap done: 1 IP address (1 host up) scanned in 6.83 seconds
23 For more information about `nmap` usage, see the
24 https://nmap.org/book/man.html[Nmap Reference Guide], also available as a manual