ans1.cw.net has no CNAME records.
Question and response
Question
dig ans1.cw.net. NS
Answer
The response has no answer records.
Authority
cw.net. 900 SOA infoblox-prk-grid01.ipam.cw.net. auto-dns.cw.net. 2022093039 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0