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nslookup
===
查询域名DNS信息的工具
## 说明
**nslookup命令** 是常用域名查询工具, 就是查DNS信息用的命令
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
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
## 选项
```
nslookup(选项)(参数)
```
```
-sil: 不显示任何警告信息
```
### 参数
域名:指定要查询域名
## 实例
```
[root@localhost ~]# nslookup www.jsdig.com
Server: 202.96.104.15
Address: 202.96.104.15#53
Non-authoritative answer:
www.jsdig.com canonical name = host.1.jsdig.com.
Name: host.1.jsdig.com
Address: 100.42.212.8
```