Maybe they forgot to renew their domainname or something
# dig japanesemotorsport.com.au ns
; <<>> DiG 9.2.1 <<>> japanesemotorsport.com.au ns
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 50866
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;japanesemotorsport.com.au. IN NS
;; AUTHORITY SECTION:
com.au. 10800 IN SOA ns1.ausregistry.net. dns.ausregistry.net.au. 2002888180 14400 3600 3600000 86400
;; Query time: 9 msec
;; SERVER: 203.98.87.3#53(203.98.87.3)
;; WHEN: Sun Jun 15 05:46:51 2003
;; MSG SIZE rcvd: 118