Apex domains cannot have CNAME records.
Question and response
Question
dig npiltd.com. NS
Answer
npiltd.com. 4 NS ns-848.awsdns-42.net.
npiltd.com. 4 NS ns-63.awsdns-07.com.
npiltd.com. 4 NS ns-1738.awsdns-25.co.uk.
npiltd.com. 4 NS ns-1692.awsdns-19.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0