Apex domains cannot have CNAME records.
Question and response
Question
dig netaddress.com. NS
Answer
netaddress.com. 2 NS dnsext01.usa.net.
netaddress.com. 2 NS vndvg055.usa.net.
netaddress.com. 2 NS cndvg054.usa.net.
netaddress.com. 2 NS dnsext02.usa.net.
Authority
The response has no authority records.
Additional
cndvg054.usa.net. 2 A 165.212.55.54
vndvg055.usa.net. 2 A 165.212.55.55
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0