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How to Determine OS of a Remote Host

When performing digital reconnaissance or penetrating testing, it’s important to fingerprint a network by understanding what operating system is used on a remote host. Nmap is a great tool for this job.

Although normally associated with the cybersecurity field and penetration testing, Nmap can also be used for benevolent purposes, such as a system administrator taking an inventory of what operating systems all the systems on his network are running.