Apex domains cannot have CNAME records.
Question and response
Question
dig mailserve.net. NS
Answer
mailserve.net. 3 NS ns2.qlc.co.in.
mailserve.net. 3 NS ns1.qlc.co.in.
Authority
The response has no authority records.
Additional
ns1.qlc.co.in. 3 A 103.19.136.4
ns2.qlc.co.in. 3 A 103.11.152.68
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0