Apex domains cannot have CNAME records.
Question and response
Question
dig rwgenting.com. NS
Answer
rwgenting.com. 4 NS egns4.genting.com.
rwgenting.com. 4 NS egns2.genting.com.
rwgenting.com. 4 NS egns1.genting.com.
Authority
The response has no authority records.
Additional
egns1.genting.com. 4 A 182.255.20.2
egns2.genting.com. 4 A 182.255.20.28
egns4.genting.com. 4 A 35.240.221.210
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0