Apex domains cannot have CNAME records.
Question and response
Question
dig datof.com. NS
Answer
datof.com. 5 NS ns1.datof.com.
datof.com. 5 NS ns2.datof.com.
Authority
The response has no authority records.
Additional
ns1.datof.com. 5 A 144.76.182.220
ns2.datof.com. 5 A 109.105.0.40
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0