Apex domains cannot have CNAME records.
Question and response
Question
dig inetbone.net. NS
Answer
inetbone.net. 2 NS auth9.ns.ham.ps-intern.de.
inetbone.net. 2 NS ns1.inetbone.net.
Authority
The response has no authority records.
Additional
ns1.inetbone.net. 2 A 213.131.232.52
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0