Nmap is the first open source tool on this list

[rifathasan]

It allows you to find hosts as well as vulnerable open ports . It will let you know the status of the selected port through the command line interface . You can also find out additional information about the found entities such as their port, state, version, and service. Additionally, you can find the OS version the software instagram database is running on, which will help you fix obvious vulnerabilities. Being open source, Nmap offers almost endless customization options, such as the ability to automate scans by writing Lua scripts. This can be very useful as it saves you the time it takes to perform scans manually.

There is also the ability to create automated scans. Nmap allows you to write scripts in Lua to perform scans automatically. Automating scans is useful as it saves time and you don’t have to manually run scans to find vulnerabilities. If you prefer to interact with the tool outside of the command line, Nmap has a GUI version called Zenmap.

It allows you to save scan profiles and run the most common scans without manual configuration, and they can also be saved for later analysis. Nmap is a great port scanner because of its simplicity, which is great for beginners, but has a lot of features for more experienced users. It also works on Windows, Linux, UNIX, and FreeBSD, and it's completely free!