Many systems and network administrators also find it useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime. Nmap ("Network Mapper") is a free and open source ( license) utility for network discovery and security auditing. Using Nmap is covered in the Reference Guide, and don't forget to read the other available documentation, particularly the new book Nmap Network Scanning! The most important changes (features, bugfixes, etc) in each Nmap version are described in the Changelog. Before downloading, be sure to read the relevant sections for your platform from the Nmap Install Guide. For the more security-paranoid (smart) users, GPG detached signatures and SHA-1 hashes for each release are available in the sigs directory ( verification instructions). Older version (and sometimes newer test releases) are available from the dist directory (and really old ones are in dist-old). Recent source releases and binary packages are described below. Nmap and Zenmap (the graphical front end) are available in several versions and formats. Nmap: the Network Mapper - Free Security Scanner
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