Apex domains cannot have CNAME records.
Question and response
Question
dig kpud.net. NS
Answer
kpud.net. 3 NS ns2.noanet.net.
kpud.net. 3 NS ns3.noanet.net.
kpud.net. 3 NS ns1.noanet.net.
Authority
The response has no authority records.
Additional
ns1.noanet.net. 3 A 66.119.192.1
ns2.noanet.net. 3 A 66.119.192.9
ns3.noanet.net. 3 A 216.211.128.105
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0