Alias records are meant to simulate a CNAME record for A record queries anywhere in a zone, but are most commonly placed at the Apex of a zone.
Placing a CNAME record at the apex of a zone is not currently supported by the Domain Name System (DNS), per RFC 1912. Putting an Alias record at the apex of a zone allows you to present a “naked domain” (e.g. https://example.com instead of “https://www.example.com”) when using a cloud provider like Amazon Web Services (AWS).
How to Add an Alias Record
Mapping Alias for Geo-locational DNS
If you intend to point an Alias record at a geo-locational aware DNS service, you will want to ensure that your provider has the correct Dyn addresses of where your Alias record will be served.
|Ashburn, VA, US||126.96.36.199/27|
|Chicago, IL, US||188.8.131.52/27|
|Palo Alto, CA, US||184.108.40.206/27|
|Hong Kong, China||220.127.116.11/27|
|Newark, NJ, US||18.104.22.168/27|
|Dallas, TX, US||22.214.171.124/27|
|Los Angeles, CA, US||126.96.36.199/27|
|Miami, FL, US||188.8.131.52/27|
|Seattle, WA, US||184.108.40.206/27|
|Sao Paolo, Brazil||220.127.116.11/27|