sin.sopranodesign.com has no CNAME records.
Question and response
Question
dig sin.sopranodesign.com. NS
Answer
The response has no answer records.
Authority
sopranodesign.com. 146 SOA ns20.digicertdns.com. dns.digicertdns.com. 2009517341 43200 3600 1209600 180
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0