Apex domains cannot have CNAME records.
Question and response
Question
dig serverange.net. NS
Answer
serverange.net. 5 NS ns1.serverange.net.
serverange.net. 5 NS ns2.serverange.net.
Authority
The response has no authority records.
Additional
ns1.serverange.net. 5 A 64.188.10.10
ns2.serverange.net. 5 A 64.188.10.50
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0