ChannelSubscribers
ChannelSubscribers[channel]
gives a list of users currently subscribed to the specified channel.
ChannelSubscribers[{channel1,channel2,…}]
gives a list of subscribed users for each of the channels channeli.
Details and Options

- In ChannelSubscribers[channel], channel can be specified as a channel object or in any of the forms used inside ChannelObject.
- You must have execute permission on a channel to receive a list of subscribers.
Examples
open all close allIntroduced in 2016
(11.0)