Yeah, as @Improper_Username suggested I just use a simple web service to retrieve information about the server.
Just send an HTTP GET request to this URL and it’ll give you enough details: http://ip-api.com/json/
Note that it isn’t always very accurate, however. e.g. it says Nevada for some servers even though Roblox doesn’t rent any servers in Nevada, etc.
Hope this helps.
UPDATE: Geo IP services are no longer accurate. Expose a way to get a server's region