dns.crescentgroupltd.com has no CNAME records.
Question and response
Question
dig dns.crescentgroupltd.com. NS
Answer
The response has no answer records.
Authority
crescentgroupltd.com. 1751 SOA dns.crescentgroupltd.com. hostmaster.crescentgroupltd.com. 1305049791 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0