Apex domains cannot have CNAME records.
Question and response
Question
dig FASTTRACKDNS.com. NS
Answer
FASTTRACKDNS.com. 5 NS NS2.FASTTRACKDNS.com.
FASTTRACKDNS.com. 5 NS NS1.FASTTRACKDNS.com.
FASTTRACKDNS.com. 5 NS NS4.FASTTRACKDNS.com.
FASTTRACKDNS.com. 5 NS NS3.FASTTRACKDNS.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0