Apex domains cannot have CNAME records.
Question and response
Question
dig turbify.biz. NS
Answer
turbify.biz. 4 NS ns-76.awsdns-09.com.
turbify.biz. 4 NS ns-1477.awsdns-56.org.
turbify.biz. 4 NS ns-995.awsdns-60.net.
turbify.biz. 4 NS ns-1995.awsdns-57.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0