MOCA Bridge IP vs Stream IP

Hello,

I am trying to document my network clients with hostnames. I have a Roamio Pro and Plus. The Plus serves as a MOCA bridge for my bedroom mini. I notice two IP addresses on my network coming from the Plus and Pro. Is the second one always for the built in stream encoder? Does the MOCA bridge take a local IP or is it performed using the IP of the Plus?

Thanks!