Apex domains cannot have CNAME records.
Question and response
Question
dig murphx.net. NS
Answer
murphx.net. 4 NS auth4.dns.gxn.net.
murphx.net. 4 NS auth1.dns.gxn.net.
murphx.net. 4 NS auth2.dns.gxn.net.
murphx.net. 4 NS auth3.dns.gxn.net.
Authority
The response has no authority records.
Additional
auth1.dns.gxn.net. 4 A 195.224.255.2
auth2.dns.gxn.net. 4 A 195.224.255.6
auth3.dns.gxn.net. 4 A 62.44.64.110
auth4.dns.gxn.net. 4 A 195.224.255.94
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0