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