Apex domains cannot have CNAME records.
Question and response
Question
dig yflnet.com. NS
Answer
yflnet.com. 2 NS ns-2005.awsdns-58.co.uk.
yflnet.com. 2 NS ns-355.awsdns-44.com.
yflnet.com. 2 NS ns-151.awsdns-18.com.
yflnet.com. 2 NS ns-249.awsdns-31.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0