Apex domains cannot have CNAME records.
Question and response
Question
dig nodeping.com. NS
Answer
nodeping.com. 5 NS ns1.nodeping.com.
nodeping.com. 5 NS ns2.nodeping.com.
nodeping.com. 5 NS ns3.nodeping.com.
Authority
The response has no authority records.
Additional
ns1.nodeping.com. 5 A 84.22.105.156
ns2.nodeping.com. 5 A 50.116.36.87
ns3.nodeping.com. 5 A 107.191.117.145
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0