Apex domains cannot have CNAME records.
Question and response
Question
dig tntechnologies.net. NS
Answer
tntechnologies.net. 4 NS ns2.tntechnologies.net.
Authority
The response has no authority records.
Additional
ns2.tntechnologies.net. 4 A 64.20.236.7
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0