Apex domains cannot have CNAME records.
Question and response
Question
dig imageinf.com. NS
Answer
imageinf.com. 5 NS ns-602.awsdns-11.net.
imageinf.com. 5 NS ns-541.awsdns-03.net.
imageinf.com. 5 NS ns-1181.awsdns-19.org.
imageinf.com. 5 NS ns-1098.awsdns-09.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0