Что-то не так с DNS?

$ dig +trace iichan.hk
; <<>> DiG 9.11.1 <<>> +trace iichan.hk
...
iichan.hk.              28800   IN      NS      ns2.404dns.com.
iichan.hk.              28800   IN      NS      ns1.404dns.com.
...
couldn't get address for 'ns2.404dns.com': not found
couldn't get address for 'ns1.404dns.com': not found
dig: couldn't get address for 'ns2.404dns.com': no more