Apex domains cannot have CNAME records.
Question and response
Question
dig mtp42.com. NS
Answer
mtp42.com. 5 NS ns1.mtp42.com.
mtp42.com. 5 NS ns2.mtp42.com.
Authority
The response has no authority records.
Additional
ns1.mtp42.com. 5 A 190.2.147.19
ns2.mtp42.com. 5 A 190.2.147.26
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0