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nslookup
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===
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查询域名DNS信息的工具
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## 补充说明
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**nslookup命令** 是常用域名查询工具，就是查DNS信息用的命令。
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nslookup4有两种工作模式，即“交互模式”和“非交互模式”。在“交互模式”下，用户可以向域名服务器查询各类主机、域名的信息，或者输出域名中的主机列表。而在“非交互模式”下，用户可以针对一个主机或域名仅仅获取特定的名称或所需信息。
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进入交互模式，直接输入nslookup命令，不加任何参数，则直接进入交互模式，此时nslookup会连接到默认的域名服务器（即`/etc/resolv.conf`的第一个dns地址）。或者输入`nslookup -nameserver/ip`。进入非交互模式，就直接输入`nslookup 域名`就可以了。
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### 语法
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```
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nslookup(选项)(参数)
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```
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```
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-sil：不显示任何警告信息。
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```
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### 参数
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域名：指定要查询域名。
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### 实例
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```
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[root@localhost ~]# nslookup www.jsdig.com
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Server: 202.96.104.15
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Address: 202.96.104.15#53
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Non-authoritative answer:
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www.jsdig.com canonical name = host.1.jsdig.com.
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Name: host.1.jsdig.com
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Address: 100.42.212.8
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```
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