Same Origin Cname
Always use a CNAME record for a subdomain when it is hosted on the same IP address as the main domain. Point the CNAME to the main domain instead of duplicating its IP address in an A record.
DNS275 Documents
Always use a CNAME record for a subdomain when it is hosted on the same IP address as the main domain. Point the CNAME to the main domain instead of duplicating its IP address in an A record.