nslookup交互模式
nslookup
> server 8.8.8.8
Default server: 8.8.8.8
Address: 8.8.8.8#53
> set type=ns
> coder4.com
Server: 8.8.8.8
Address: 8.8.8.8#53

Non-authoritative answer:
coder4.com nameserver = dns8.hichina.com.
coder4.com na[......]

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