Apex domains cannot have CNAME records.
Question and response
Question
dig flashstart.com. NS
Answer
flashstart.com. 2 NS ns11.domaincontrol.com.
flashstart.com. 2 NS ns12.domaincontrol.com.
Authority
The response has no authority records.
Additional
ns11.domaincontrol.com. 1 A 97.74.105.6
ns12.domaincontrol.com. 1 A 173.201.73.6
ns11.domaincontrol.com. 1 AAAA 2603:5:2190:0:0:0:0:6
ns12.domaincontrol.com. 1 AAAA 2603:5:2290:0:0:0:0:6
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0