Below is the list of URLs and corresponding Azure DataCenter names that you will need to please whitelist.
admin.xogo.io – West US
api2.xogo.io – West US
realtime.xogo.io – West US
xogo.blob.core.windows.net – West US2
xogocdn.azureedge.net – West US2
The IP ranges for the data centers can be found here: https://www.microsoft.com/en-us/download/details.aspx?id=41653 Please let us know if you need any additional information!