The NatNetTwo2OSC software is located under
D:\Software\NatNet2OSC\Motive1.x
inside this folder is a batchfile called Motive1_to_App
right-click - open and you can edit the startup parameters:
D:\Software\NatNet2OSC\Motive1.x\NatNet2OSC 127.0.0.1 54321 239.255.42.99 0 0
if you want to create another batchfile, simply copy this file and change the settings accordingly.