Amazon Route 53 now supports Certification Authority Authorization (CAA) resource record sets, which let you specify the certificate authorities that can issue certificates for your domains and subdomains. CAA support brings Route 53 into compliance with the Certification Authority and Browser Forum (CA/Browser Forum) requirement that certificate authorities (CA’s) check for the presence of a DNS CAA record before issuing a certificate for a domain. For more information, see CAA Format in the Amazon Route 53 Developer Guide.