For a production web app, you probably want users to see a custom domain name. Today we are announcing the preview of App Service domain. App Service domain (preview) gives you a first class experience in the Azure portal to create and manage domains that will be hosted on Azure DNS for your Azure services such as Web Apps, Traffic Manager, Virtual Machines, and more.
App Service domains (preview) simplifies the life cycle of creating and managing a domain for Azure services leveraging Azure DNS. Azure DNS then provides reliable performant and secure options of hosting your domains. App Service domains is currently limited to the following TLDs, com, net, co.uk, org, nl, in, biz, org.uk, and co.in. To get started with creating a domain, please see How to buy a domain for App Service.
Read more about it on the Azure blog.