How to get a list of active subscribers/connections of a channel/topic using the API?

Hi all,
does anyone know how to get a list of the active subscribers/connections for a given channel (Topic or Queue) in UM using the Java API?!

I know we can set up listeners to be notified when connections are created or destroyed, but I’d like to get a list of the connections already created.

Bear in mind I need to know the actual host/ip of the client, not a mere count of the number of connections.