Apex domains cannot have CNAME records.
Question and response
Question
dig wisetipscorner.com. NS
Answer
wisetipscorner.com. 5 NS ns2.wisetipscorner.com.
wisetipscorner.com. 5 NS ns1.wisetipscorner.com.
Authority
The response has no authority records.
Additional
ns1.wisetipscorner.com. 5 A 104.140.13.242
ns2.wisetipscorner.com. 5 A 173.44.187.172
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0