Apex domains cannot have CNAME records.
Question and response
Question
dig foxtel.com.au. NS
Answer
foxtel.com.au. 5 NS ns-327.awsdns-40.com.
foxtel.com.au. 5 NS ns-1239.awsdns-26.org.
foxtel.com.au. 5 NS ns-608.awsdns-12.net.
foxtel.com.au. 5 NS ns-1619.awsdns-10.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0