dns.resolver.domains has no CNAME records.
Question and response
Question
dig dns.resolver.domains. NS
Answer
The response has no answer records.
Authority
resolver.domains. 871 SOA ns-1566.awsdns-03.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0