Can Windows Azure roles detect which datacenter the roles are in?

It is a great question and I have talked about it couple of time with different partners. Based on my understanding when you create your service and provide where you want this service to location ("South Central US" or "Anywhere US"), this information is stored at the RDFE server specific to your service in your Azure subscription. So when you choose a fixed location such as "South Central US" or "North Central US" the service actually deployed to that location and exact location is stored however when you choose "Anywhere US", the selection to choose "South Center" or "North Central" is done internally however the selected location never updated to RDFE server related to your service.

Two days ago Microsoft published an XML file containing a list of IP ranges per region. Based on this file and the IP address of your role you can find in which datacenter the role has been deployed.

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