Apex domains cannot have CNAME records.
Question and response
Question
dig pioneerelabs.com. NS
Answer
pioneerelabs.com. 5 NS ns5.ctrls.in.
pioneerelabs.com. 5 NS ns4.ctrls.in.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0