Zenmap is the official graphical user interface (GUI) for the Nmap Security Scanner. It is a multi-platform, free and open-source application designed to make Nmap easy for beginners to use while providing advanced features for experienced Nmap users. The purpose of Zenmap is not to replace Nmap. You still can use the good old command-line, but you will be able to use some advanced features like the “Topology” tab. This is an interactive view of the connections between hosts in a network. The following article will explain how to install Zenmap 5.0 on an Ubuntu system and how to use the main features.