Apex domains cannot have CNAME records.
Question and response
Question
dig tip.net.au. NS
Answer
tip.net.au. 5 NS ns3.ozlabs.org.
tip.net.au. 5 NS ns1.tip.net.au.
tip.net.au. 5 NS ns.ozlabs.org.
tip.net.au. 5 NS ns4.ozlabs.org.
Authority
The response has no authority records.
Additional
ns.ozlabs.org. 5 A 150.107.74.76
ns1.tip.net.au. 5 A 101.0.121.146
ns3.ozlabs.org. 5 A 66.228.55.133
ns4.ozlabs.org. 5 A 178.79.181.204
ns.ozlabs.org. 5 AAAA 2404:9400:2221:ea00:0:0:0:1
ns1.tip.net.au. 5 AAAA 2401:fc00:0:129:0:0:0:2
ns3.ozlabs.org. 5 AAAA 2600:3c00:0:0:f03c:91ff:fedf:87f4
ns4.ozlabs.org. 5 AAAA 2a01:7e00:0:0:f03c:91ff:fe61:9fa
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0