NDI Access Manager is a great way to monitor your NDI network. In NDI TV's recent video they cover everything you need to know and how NDI Access Manager works. Check out the video here.
"This video explains how to use NDI Access Manager which allows you to manage the visibility and accessibility of NDI systems and sources on your network. NDI Access Manager allows you to organize your NDI channels into groups, choose which groups are available to your device, and select which groups can receive your NDI channels—making it easy to determine the availability of NDI channels across your network. Download it for free now at NDI.TV"