Apex domains cannot have CNAME records.
Question and response
Question
dig hostzop.com. NS
Answer
hostzop.com. 4 NS ns22.hostzop.com.
hostzop.com. 4 NS ns21.hostzop.com.
hostzop.com. 4 NS ns23.hostzop.com.
Authority
The response has no authority records.
Additional
ns21.hostzop.com. 4 A 103.191.132.77
ns22.hostzop.com. 4 A 157.20.172.16
ns23.hostzop.com. 4 A 157.20.172.17
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0