Apex domains cannot have CNAME records.
Question and response
Question
dig anycast.net.au. NS
Answer
anycast.net.au. 5 NS jarred.ns.cloudflare.com.
anycast.net.au. 5 NS becky.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0