ccTLD/au/com.auについて、ここに記述してください。
com.au は au と同居
$ dnsq ns com.au x.au
2 com.au: 88 bytes, 1+4+0+0 records, response, authoritative, noerror query: 2 com.au answer: com.au 86400 NS x.au answer: com.au 86400 NS w.au answer: com.au 86400 NS z.au answer: com.au 86400 NS y.au
$ dnsq a www.google.com.au x.au
1 www.google.com.au: 117 bytes, 1+0+4+0 records, response, noerror query: 1 www.google.com.au authority: google.com.au 14400 NS ns4.google.com authority: google.com.au 14400 NS ns2.google.com authority: google.com.au 14400 NS ns1.google.com authority: google.com.au 14400 NS ns3.google.com