ns.cv.ua has no CNAME records.
Question and response
Question
dig ns.cv.ua. NS
Answer
The response has no answer records.
Authority
cv.ua. 2323 SOA ns.cv.ua. hostmaster.cv.ua. 2022088068 3636 1212 1814400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0