Couldn't creat a web app using azure app service for a particular name which is not active in use elsewhere

Question

I can't able to use a name for web app which is not actively in use ( insightshubprodwebapp1) . A subdomain of a web applicatioin has this dangling CNAME pointing to azurewebsites with this give name (insightshubprodwebapp1) and to prove the claim for penetration testing report as a Proof of concept, I need to create a web app with this name. I need help in knowing the status of this name or any other reason that is not letting me to create web app with this name.. I'm adding that web application's DNS record for your reference which indicates the unavailability of this particular name.

Answer 1

Hi @Gokul S thanks for bringing this to our attention. The DNS record you shared means a CNAME record pointing to azurewebsites.net with the name insightshubprodwebapp1. This suggests an old web app might have existed with this name, but it's currently not active.

Here are a few key points to consider when it comes to CNAME record :

1. Azure Web App names must be globally unique across all of Azure, not just within your subscription
2. Even if a web app is deleted, the name may remain reserved for some time to prevent security issues like subdomain takeover
3. Microsoft specifically implements protections against subdomain takeover attacks, which is likely why you cannot claim this name

Is it possible for you to use another name for the web app?