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"Nmap is a free and open source network discovery and security auditing utility that is widely used in the Linux users community as it is simple to use yet very powerful. Nmap works by sending data packets on a specific target (by IP) and by interpreting the incoming packets to determine what posts are open/closed, what services are running on the scanned system, whether firewalls or filters are set up and enabled, and finally what operation system is running. Those abilities are used for a wide variety of reasons and howtoforge.com is not encouraging nor suggesting the use of nmap for malicious purposes"

"Nmap is a great security scanner. Many systems and network administrators use it for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime. In this article, I'll guide you through how to use Nmap commands."

"by Vivek Gite on July 12, 2007 last updated November 27, 2015 in Linux, Networking, UNIX How do I find out which ports are opened on my own server? How do I run port scanning using the nc command instead of the nmap command on a Linux or Unix-like systems?"