Apex domains cannot have CNAME records.
Question and response
Question
dig hsrei.com. NS
Answer
hsrei.com. 4 NS ns7.dnsmadeeasy.com.
hsrei.com. 4 NS ns7.dnsmadeeasy.com.azure-dns.info.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0