ns1.dan.com has no CNAME records.
Question and response
Question
dig ns1.dan.com. NS
Answer
The response has no answer records.
Authority
dan.com. 3600 SOA a1-245.akam.net. dns.jomax.net. 2025102300 300 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0