To determine the IP address of a Brightsign player using the BSN.cloud navigate to the Network tab in BrightAuthor:connected.
Under Network, the Device List lists all of the BrightSign devices connected to your BrightSign account. Click the settings drop-down icon in the top right corner of Device List and check the IP Address box.
The IP address of each device connected to your BrightSign account will be listed on the far right of the info bar under All Devices > IP Address.
For alternative methods on determining the local IP address of a BrightSign device refer to here.