Apex domains cannot have CNAME records.
Question and response
Question
dig asctimetables.com. NS
Answer
asctimetables.com. 5 NS ns.edupage8.org.
asctimetables.com. 5 NS ns.edupage3.org.
asctimetables.com. 5 NS ns.edupage4.org.
asctimetables.com. 5 NS ns.edupage9.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0