Apex domains cannot have CNAME records.
Question and response
Question
dig webnx.com. NS
Answer
webnx.com. 4 NS ns1.webnx.com.
webnx.com. 4 NS ns4.webnx.com.
webnx.com. 4 NS ns3.webnx.com.
webnx.com. 4 NS ns2.webnx.com.
Authority
The response has no authority records.
Additional
ns1.webnx.com. 4 A 142.4.42.4
ns2.webnx.com. 4 A 100.42.212.162
ns3.webnx.com. 4 A 50.115.33.74
ns4.webnx.com. 4 A 100.42.217.98
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0