Is there a published list of IP's for the Plex network?

I have my Plex server open to the internet on a manually specified port. In reviewing my firewall logs today, I noticed numerous different external IP’s connecting to my Plex server on that port. Whois lookups are all over the place… some in Ireland, some in Ashburn, VA, etc…

I’m thinking these are Plex’s own servers but I have no real way of knowing. Is there a published list somewhere?

Jeremy

Or can I tell from the plex server logs if users are trying to authenticate to it?