A Comprehensive Guide to Nmap with Screenshots

LinuxSecurity.com: Nmap ("Network Mapper") is a free open source utility for network exploration or security auditing. It was designed to rapidly scan large networks, although it works fine against single hosts. Nmap uses raw IP packets in novel ways to determine what hosts are available on the network, what services (application name and version) those hosts are offering, what operating systems (and OS versions) they are running, what type of packet filters/firewalls are in use, and dozens of other characteristics. Nmap runs on most types of computers and both console and graphical versions are available. This article is a quick user's guide to Nmap. I use this tool all the time it's a good easy to use tool for testing what services and ports are open.

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