命令简介
nslookup（name server lookup）命令用于查询域名 DNS 信息的工具。nslookup 有两种工作模式，即“交互模式”和“非交互模式”。
代码语言：javascript复制[root@CentOS7-1 ~]# nslookup
-bash: nslookup: command not found
[root@CentOS7-1 ~]# yum install -y bind-utils
语法格式
代码语言：javascript复制nslookup [-option] [name | -] [server]
选项说明
代码语言：javascript复制-query=TYPE #设置查询类型
-timeout=NUMBER #设置等待响应的超时时间，单位秒
-sil #不显示任何警告信息。
还有一些交互的命令，有兴趣的读者可以查看帮助信息阅读。
应用举例
实例
代码语言：javascript复制非交互式模式
[root@CentOS7-1 ~]# nslookup www.baidu.com
Server: 223.5.5.5
Address: 223.5.5.5#53
Non-authoritative answer:
www.baidu.com canonical name = www.a.shifen.com.
Name: www.a.shifen.com
Address: 36.152.44.96
Name: www.a.shifen.com
Address: 36.152.44.95
#交互式模式
[root@CentOS7-1 ~]# nslookup
> baidu.com
Server: 223.5.5.5
Address: 223.5.5.5#53
Non-authoritative answer:
Name: baidu.com
Address: 39.156.69.79
Name: baidu.com
Address: 220.181.38.148
> 163.com
Server: 223.5.5.5
Address: 223.5.5.5#53
Non-authoritative answer:
Name: 163.com
Address: 123.58.180.7
Name: 163.com
Address: 123.58.180.8
google.com 相关的信息
代码语言：javascript复制#在您的 DNS 中查询与域名 google.com 相关的所有可用信息。
[root@CentOS7-1 ~]# nslookup -type=any google.com
Server: 223.5.5.5
Address: 223.5.5.5#53
Non-authoritative answer:
Name: google.com
Address: 93.46.8.90
google.com nameserver = ns1.google.com.
google.com nameserver = ns2.google.com.
google.com nameserver = ns4.google.com.
google.com nameserver = ns3.google.com.
Authoritative answers can be found from:
#在您的 DNS 中查询与域名 google.com 相关邮件交换服务器的信息
[root@CentOS7-1 ~]# nslookup -type=mx google.com
Server: 223.5.5.5
Address: 223.5.5.5#53
Non-authoritative answer:
google.com mail exchanger = 10 aspmx.l.google.com.
google.com mail exchanger = 50 alt4.aspmx.l.google.com.
google.com mail exchanger = 20 alt1.aspmx.l.google.com.
google.com mail exchanger = 30 alt2.aspmx.l.google.com.
google.com mail exchanger = 40 alt3.aspmx.l.google.com.
Authoritative answers can be found from:
反向查找一个地址(文中地址作了处理哈)
代码语言：javascript复制[root@CentOS7-1 ~]# nslookup 200.208.150.3
Server: 103.240.22.111
Address: 103.240.22.111#53
Non-authoritative answer:
3.150.208.200.in-addr.arpa name = 200.208.150.3.xmission.com.
Authoritative answers can be found from:
150.208.200.in-addr.arpa nameserver = ns1.xmission.com.
150.208.200.in-addr.arpa nameserver = ns2.xmission.com.
150.208.200.in-addr.arpa nameserver = ns.xmission.com.
