

NMAP got a GUI in April 1999, however, the majority of users continued to favor the command line. The second version, which included more tools, enhancements, and features, was released in December 1998 and included 8,000 lines of code. It was first published as a 2,000-line article in Issue 51 of the Phrack journal, with a slightly modified version appearing in Issue 52. In terms of technology, NMAP has a somewhat lengthy history, starting in September 1997. It is frequently used by IT security firms to simulate the kinds of assaults that a system can encounter. However, users of the software platform are not limited to hackers.
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A hacker would only need to run Nmap on the target machine, search for vulnerabilities, and figure out how to exploit them in order to gain access. Hackers can use Nmap to access unrestricted ports on a system. It is simple to use and has both a graphical user interface (GUI) and a command-line interface (CLI) (GUI). When conducting network penetration testing, Nmap is useful and Nmap may be used on various common operating systems, including Linux, Windows, macOS, and BSD. It is frequently used by network managers to identify the active devices on a system, the port number to which they are connected, and any open ports that might be in use. Its design enables fast analysis of both small-scale networks and individual hosts.

Gordon Lyon created the open-source security auditing and network scanning program known as Nmap or Network Mapper.
