Apex domains cannot have CNAME records.
Question and response
Question
dig netshield.ltd. NS
Answer
netshield.ltd. 5 NS junade.ns.cloudflare.com.
netshield.ltd. 5 NS suzanne.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0