ANAME (CNAME Flattening)

is a technique used in DNS that combines the advantages of a CNAME record with the ability to use it on the root domain. Normally, a CNAME record cannot be used on the root domain (apex) because it can cause issues with the rest of the DNS system.

How Does It Work?

Instead of a traditional CNAME record on the root domain, DNS providers use an ANAME record that acts like a CNAME. This means that when a query is made to the root domain, the DNS server internally „flattens“ the CNAME reference and returns the resulting IP address. The user therefore enjoys the same benefits as if a CNAME record were set up, but without the risk of incompatibility with DNS standards.

Why Is It Useful?

• Flexibility: It allows aliasing of the root domain, which was not previously possible with a conventional CNAME.
• Compatibility: It maintains compatibility with DNS standards by internally converting the CNAME record into an A or AAAA record, which is permitted.
• Simplified Management: It enables easier domain management, allowing you to have your primary domain point to a dynamic address without the need to manually update A or AAAA records.

Overall, an ANAME record with CNAME flattening functionality provides modern web services with greater flexibility and simplifies DNS management, especially when you need to alias the root domain.