说明：
以下是在linux下的操作实例，win下的nslookup操作实例请看附录1：win下的nslookup操作实例
nslookup有2种模式，交互模式、非交互模式
实例：
一、以下实例为nslookup非交互模式下操作
实例1：查找域名A记录
# nslookup coolnull.com Server: 100.100.2.138 Address: 100.100.2.138#53 Non-authoritative answer: Name: coolnull.com Address: 120.24.240.59
查找域名A记录
上面下面都一样，只是查询的时候多了-query=a，因为nslookup默认就是查询a记录，所以不写也一样。
# nslookup -query=a coolnull.com Server: 100.100.2.138 Address: 100.100.2.138#53 Non-authoritative answer: Name: coolnull.com Address: 120.24.240.59 ###这是解析出来coolnull.com对应的ip地址
实例2：查询域名A记录，指定dns服务器，通过在域名后指定dns服务器地址
# nslookup coolnull.com 8.8.8.8 Server: 8.8.8.8 Address: 8.8.8.8#53 Non-authoritative answer: Name: coolnull.com Address: 120.24.240.59
实例3：查找MX记录
# nslookup -query=mx coolnull.com Server: 100.100.2.138 Address: 100.100.2.138#53 Non-authoritative answer: coolnull.com mail exchanger = 10 mxbiz2.qq.com. ###域名mx记录为mxbiz1.qq.com.、mxbiz2.qq.com.有用过qq免费域名邮箱的应该熟悉，当然还有mxdomain.qq.com.这个 coolnull.com mail exchanger = 5 mxbiz1.qq.com. Authoritative answers can be found from: renjianrenai.net nameserver = f1g1ns2.dnspod.net. renjianrenai.net nameserver = f1g1ns1.dnspod.net. mxbiz1.qq.com internet address = 163.177.89.176 mxbiz1.qq.com internet address = 112.90.78.144 mxbiz2.qq.com internet address = 112.90.78.144 mxbiz2.qq.com internet address = 163.177.89.176 f1g1ns1.dnspod.net internet address = 58.247.212.36 f1g1ns1.dnspod.net internet address = 115.236.151.191 f1g1ns1.dnspod.net internet address = 180.163.19.15 f1g1ns1.dnspod.net internet address = 182.140.167.166 f1g1ns1.dnspod.net internet address = 14.215.150.17 f1g1ns2.dnspod.net internet address = 52.220.136.67 f1g1ns2.dnspod.net internet address = 61.129.8.159 f1g1ns2.dnspod.net internet address = 101.226.220.16 f1g1ns2.dnspod.net internet address = 121.51.128.164 f1g1ns2.dnspod.net internet address = 182.140.167.188
实例4：查找域名CNAME记录
# nslookup -query=cname www.baidu.com Server: 100.100.2.138 Address: 100.100.2.138#53 Non-authoritative answer: www.baidu.com canonical name = www.a.shifen.com. ###可以看到www.baidu.com是cname到www.a.shifen.com Authoritative answers can be found from: baidu.com nameserver = ns3.baidu.com. baidu.com nameserver = ns7.baidu.com. baidu.com nameserver = ns2.baidu.com. baidu.com nameserver = dns.baidu.com. baidu.com nameserver = ns4.baidu.com. dns.baidu.com internet address = 202.108.22.220 ns2.baidu.com internet address = 61.135.165.235 ns3.baidu.com internet address = 220.181.37.10 ns4.baidu.com internet address = 220.181.38.10 ns7.baidu.com internet address = 180.76.76.92
实例5：查看域名NS（nameserver）记录
# nslookup -query=ns coolnull.com Server: 100.100.2.138 Address: 100.100.2.138#53 Non-authoritative answer: coolnull.com nameserver = f1g1ns1.dnspod.net. ###这边可以看到coolnull.com的ns地址为f1g1ns1.dnspod.net.和f1g1ns2.dnspod.net.，这是dnspod免费域名服务器的域名地址。 coolnull.com nameserver = f1g1ns2.dnspod.net. Authoritative answers can be found from: f1g1ns1.dnspod.net internet address = 180.163.19.15 ####dnspod免费域名服务器的域名对应的ip地址 f1g1ns1.dnspod.net internet address = 182.140.167.166 f1g1ns1.dnspod.net internet address = 14.215.150.17 f1g1ns1.dnspod.net internet address = 58.247.212.36 f1g1ns1.dnspod.net internet address = 115.236.151.191 f1g1ns2.dnspod.net internet address = 61.129.8.159 f1g1ns2.dnspod.net internet address = 101.226.220.16 f1g1ns2.dnspod.net internet address = 121.51.128.164 f1g1ns2.dnspod.net internet address = 182.140.167.188 f1g1ns2.dnspod.net internet address = 52.220.136.67
二、以下实例为nslookup交互模式下操作
要进入nslooku交互模式只需要在命令行输入nslookup即可，更多参数可以查看这篇nslookup – man手册
实例1：查找域名A记录
# nslookup > set query=a > coolnull.com Server: 100.100.2.138 Address: 100.100.2.138#53 Non-authoritative answer: Name: coolnull.com Address: 120.24.240.59 ###这是解析出来coolnull.com对应的ip地址
实例2：查找MX记录
# nslookup > set query=mx ###set query=mx后，可以直接输入其它域名查找该域名的mx记录。不需要再重复set query=mx；当然如果要查找其它记录，如a记录，还是需要再set query=a > coolnull.com Server: 100.100.2.138 Address: 100.100.2.138#53 Non-authoritative answer: coolnull.com mail exchanger = 5 mxbiz1.qq.com. ###域名mx记录为mxbiz1.qq.com.、mxbiz2.qq.com. coolnull.com mail exchanger = 10 mxbiz2.qq.com. Authoritative answers can be found from: renjianrenai.net nameserver = f1g1ns2.dnspod.net. renjianrenai.net nameserver = f1g1ns1.dnspod.net. mxbiz1.qq.com internet address = 163.177.89.176 mxbiz1.qq.com internet address = 112.90.78.144 mxbiz2.qq.com internet address = 112.90.78.144 mxbiz2.qq.com internet address = 163.177.89.176 f1g1ns1.dnspod.net internet address = 14.215.150.17 f1g1ns1.dnspod.net internet address = 58.247.212.36 f1g1ns1.dnspod.net internet address = 115.236.151.191 f1g1ns1.dnspod.net internet address = 180.163.19.15 f1g1ns1.dnspod.net internet address = 182.140.167.166 f1g1ns2.dnspod.net internet address = 61.129.8.159 f1g1ns2.dnspod.net internet address = 101.226.220.16 f1g1ns2.dnspod.net internet address = 121.51.128.164 f1g1ns2.dnspod.net internet address = 182.140.167.188 f1g1ns2.dnspod.net internet address = 52.220.136.67
实例3：查找域名CNAME记录
# nslookup > www.baidu.com Server: 100.100.2.138 Address: 100.100.2.138#53 Non-authoritative answer: www.baidu.com canonical name = www.a.shifen.com. ###可以看到www.baidu.com是cname到www.a.shifen.com Authoritative answers can be found from: baidu.com nameserver = ns4.baidu.com. baidu.com nameserver = ns2.baidu.com. baidu.com nameserver = ns3.baidu.com. baidu.com nameserver = dns.baidu.com. baidu.com nameserver = ns7.baidu.com. dns.baidu.com internet address = 202.108.22.220 ns2.baidu.com internet address = 61.135.165.235 ns3.baidu.com internet address = 220.181.37.10 ns4.baidu.com internet address = 220.181.38.10 ns7.baidu.com internet address = 180.76.76.92
实例4：查看域名NS（nameserver）记录
# nslookup > set query=ns > coolnull.com Server: 100.100.2.138 Address: 100.100.2.138#53 Non-authoritative answer: coolnull.com nameserver = f1g1ns2.dnspod.net. ###域名coolnull.com的ns地址 coolnull.com nameserver = f1g1ns1.dnspod.net. Authoritative answers can be found from: f1g1ns1.dnspod.net internet address = 115.236.151.191 f1g1ns1.dnspod.net internet address = 180.163.19.15 f1g1ns1.dnspod.net internet address = 182.140.167.166 f1g1ns1.dnspod.net internet address = 14.215.150.17 f1g1ns1.dnspod.net internet address = 58.247.212.36 f1g1ns2.dnspod.net internet address = 182.140.167.188 f1g1ns2.dnspod.net internet address = 52.220.136.67 f1g1ns2.dnspod.net internet address = 61.129.8.159 f1g1ns2.dnspod.net internet address = 101.226.220.16 f1g1ns2.dnspod.net internet address = 121.51.128.164
附录：
附录1：附录1：win下的nslookup操作实例
win下的nslookup操作实例，查找域名的a记录、mx记录、cname记录、ns记录
附录2：以下为可用的查询类型，不区别大小写
A 地址记录(Ipv4)
AAAA 地址记录（Ipv6）
AFSDB Andrew文件系统数据库服务器记录（不懂）
ATMA ATM地址记录（不是自动提款机）
CNAME 别名记录
HINFO 硬件配置记录，包括CPU、操作系统信息
ISDN 域名对应的ISDN号码
MB 存放指定邮箱的服务器
MG 邮件组记录
MINFO 邮件组和邮箱的信息记录
MR 改名的邮箱记录
MX 邮件服务器记录，preference为优先级，该数值越小则优先级越高。
NS 名字服务器记录
PTR 反向记录（从IP地址解释域名）
RP 负责人记录
RT 路由穿透记录
SRV TCP服务器信息记录
TXT 域名对应的文本信息
X25 域名对应的X.25地址记录