What type of DNS record is required for Azure to verify a custom domain name?

To verify a custom domain name in Azure, a TXT (Text) record is required. When setting up a custom domain for services such as Azure App Service or Azure CDN, Azure requires you to prove ownership of the domain. This is done through DNS verification, where you add a specified TXT record to your domain's DNS zone.

The TXT record contains a specific string that Azure provides during the domain verification process. Once the record is added, Azure can query the DNS to confirm that the record exists and that you own the domain by matching it with the expected value. This form of verification is critical for ensuring secure configurations and preventing unauthorized usage of domain names.

This method of domain verification is both straightforward and effective, which is why it is the standard approach in Azure and many other services when it comes to confirming ownership of a domain through DNS entries.