Nagios Enterprises offers a of Nagios XI. This is not a trial; it is a permanently free license, but it comes with specific limits.
"I can crack Nagios XI to get unlimited free hosts." Fact: Nagios is reasonably priced (starting around $1,995 for 100 nodes). Piracy is illegal and unsupported. Use Nagios Core instead.
"Nagios Core is obsolete." Fact: Thousands of companies still run Core. It is stable, lightweight, and totally free. nagios xi free
You can indefinitely monitor up to seven (7) nodes (hosts). In Nagios, a "node" is any physical or virtual device with an IP address, such as a server, router, or smart home device.
Generate professional SLA and availability reports that Core simply doesn't offer out of the box. How to Get Started Nagios Enterprises offers a of Nagios XI
Access to over 90 built-in wizards that simplify the setup of complex monitoring tasks for databases, cloud resources, and network equipment.
Set up monitoring for a Windows Server, a switch, or a website in minutes without touching a config file. Piracy is illegal and unsupported
Small businesses, home labs, or IT pros who want to learn Nagios XI before buying a production license.
There is for production environments beyond 7 hosts. However, the official free 7-host license is perfect for small deployments or learning. For unlimited free monitoring, switch to Nagios Core or consider modern alternatives like Zabbix or Prometheus (which are also free and open source).
When IT administrators search for they are usually looking for one of two things: a completely open-source alternative to the enterprise edition, or a legitimate, no-cost way to use Nagios XI itself.
If you need to monitor more than 7 devices with a GUI and can't pay, – just be ready to edit some configuration files by hand.