This month marks the 20th anniversary of Nmap, the open-source network mapping tool that became the standard used by many IT professionals, but that can be a bit much if you only need to do general network maintenance and are intimidated by its command-line interface.
There are alternatives – not many – that range in technical sophistication from tools with GUIs that can ease you into performing the essentials of network maintenance to more advanced software that is similar to Nmap itself.
[ Also see reviews of Icinga, Observium, Nagios and Zabbix network-monitoring software.]
Like Nmap, all these network tools are free.
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