Thanks Enrique. We are deploying UAA in cloud.gov for our agency and it will be used by applications deployed in cloud.gov for our agency. I can add a nginx proxy in front but I think I should be able to filter IP addresses with spring or in the web.xml. I can also probably check all the URLs used for a authentication_code or client_credentials flow using chrome and then whitelist only those. However, I am trying to see if this list is documented anywhere that I can simply use it.