Apex domains cannot have CNAME records.
Question and response
Question
dig tommy23456.com. NS
Answer
tommy23456.com. 5 NS ns-1948.awsdns-51.co.uk.
tommy23456.com. 5 NS ns-701.awsdns-23.net.
tommy23456.com. 5 NS ns-524.awsdns-01.net.
tommy23456.com. 5 NS ns-1266.awsdns-30.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0