Hi @ugeeko, the difference is that with the Unlimited node license from Nagios.com, you get access to the telephone support should you have any issues. With the core services platform on nagios.org, you're limited to best-effort support from this forum. I hope that helps you!

Hi, So if i get the unlimited node license from nagios.org. I will have unlimited nodes within Nagios CSP which is Nagios XI?

The CSP commercial license includes Nagios XI, yes. You would, however, not have the full support options that the standard Nagios XI licenses offer.