oz.sopranodesign.com has no CNAME records.
Question and response
Question
dig oz.sopranodesign.com. NS
Answer
The response has no answer records.
Authority
sopranodesign.com. 141 SOA ns20.digicertdns.com. dns.digicertdns.com. 2009517345 43200 3600 1209600 180
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0