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Route 53 follows the DNS spec and CNAMEs can only exist alone for a particular name [1] (aside from DNSSEC records). In this case, those other DNS providers are out of spec.
answered 4 years ago
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Hey Justin, thanks for the update. Can you please confirm which DNS Spec they follow? I am trying to determine if it is RFC 1035 or RFC 2181.
I've updated the answer; it's RFC 1034.