Apex domains cannot have CNAME records.
Question and response
Question
dig bondi.oz.au. NS
Answer
bondi.oz.au. 5 NS ns2.he.net.
bondi.oz.au. 5 NS ns.bondi.oz.au.
bondi.oz.au. 5 NS smtp.sw.oz.au.
bondi.oz.au. 5 NS ns5.he.net.
Authority
The response has no authority records.
Additional
ns.bondi.OZ.AU. 5 A 203.31.96.3
ns2.he.net. 5 A 216.218.131.2
ns5.he.net. 5 A 216.66.80.18
ns.bondi.OZ.AU. 5 AAAA 2403:5812:c2f1:0:0:0:1:53
ns2.he.net. 5 AAAA 2001:470:200:0:0:0:0:2
ns5.he.net. 5 AAAA 2001:470:500:0:0:0:0:2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0