Ok thank you for this information. It's also what I have imagine but in fact it's not what I am see.
I configured with madmaper thru the export option an static ip adresse which is 192.168.0.2
When I put the MiniMad on my domestic network (which have a DHCP router) I found the MiniMad on 192.168.1.24.
But at the same time, MiniMad show me on his screen Artnet : 192.168.0.2
So that's the reason why I ask you this question.
I hope we will explain me more with this new information.