nslookup

# nslookup
dns查询命令，支持代参数查询也支持内置命令行,windows与linux参数

## 一、带参数查询
```shell
# 默认查询
[root@nginxproxy-01 nginx]# nslookup qq.com
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
Name:	qq.com
Address: 61.129.7.47
Name:	qq.com
Address: 203.205.254.157
Name:	qq.com
Address: 183.3.226.35
Name:	qq.com
Address: 123.151.137.18

# 查询AAAA记录
[root@nginxproxy-01 nginx]# nslookup -type=AAAA pi.ihoiwan.com
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
pi.ihoiwan.com	has AAAA address 2409:8a55:307e:16e0:ab6c:8bbc:13ee:ad06

Authoritative answers can be found from:
ihoiwan.com	nameserver = dns4.hichina.com.
ihoiwan.com	nameserver = dns3.hichina.com.
dns3.hichina.com	internet address = 140.205.81.23
dns3.hichina.com	internet address = 106.11.141.113
dns3.hichina.com	internet address = 106.11.141.123
dns3.hichina.com	internet address = 106.11.211.53
dns3.hichina.com	internet address = 106.11.211.63
dns3.hichina.com	internet address = 140.205.41.13
dns3.hichina.com	internet address = 140.205.41.23
dns3.hichina.com	internet address = 140.205.81.13
dns3.hichina.com	has AAAA address 2400:3200:2000:22::1
dns4.hichina.com	internet address = 140.205.81.14
dns4.hichina.com	internet address = 140.205.81.24
dns4.hichina.com	internet address = 106.11.141.114
dns4.hichina.com	internet address = 106.11.141.124
dns4.hichina.com	internet address = 106.11.211.54
dns4.hichina.com	internet address = 106.11.211.64
dns4.hichina.com	internet address = 140.205.41.14
dns4.hichina.com	internet address = 140.205.41.24
dns4.hichina.com	has AAAA address 2400:3200:2000:23::1
```

## 二、使用内置命令行查询
```shell
# 先进入内置命令行
[root@nginxproxy-01 nginx]#  nslookup
# 设置查询AAAA记录
> set type=AAAA
> www.sustech.edu.cn
Server:		1.1.1.3
Address:	1.1.1.3#53

www.sustech.edu.cn	canonical name = sustech.edu.cn.
sustech.edu.cn	has AAAA address 2001:da8:201d::42:3
# 设置查询PTR记录
> set type=PTR
> 1.1.1.1

Server:		1.1.1.1
Address:	1.1.1.1#53

3.1.1.1.in-addr.arpa	name = twww.sustech.edu.cn.
3.1.1.1.in-addr.arpa	name = new.sustech.edu.cn.
3.1.1.1.in-addr.arpa	name = webmail.sustech.edu.cn.
3.1.1.1.in-addr.arpa	name = www.sustech.edu.cn.
3.1.1.1.in-addr.arpa	name = new.sustc.edu.cn.
3.1.1.1.in-addr.arpa	name = webmail.sustc.edu.cn.
3.1.1.1.in-addr.arpa	name = sustech.edu.cn.
```

## 三、通过DNS和内网IP查询外网IP
在内网结合PTR记录及外网DNS，就可以查到该IP的外网IP了，但不能保证百分百准确。

下面是具体步骤：

```shell
# 1.先反查域名
[root@nginxproxy-01 nginx]# nslookup -type=PTR 1.1.1.3

Server:		1.1.1.1
Address:	1.1.1.1#53

3.1.1.1.in-addr.arpa	name = twww.sustech.edu.cn.
3.1.1.1.in-addr.arpa	name = new.sustech.edu.cn.
3.1.1.1.in-addr.arpa	name = webmail.sustech.edu.cn.
3.1.1.1.in-addr.arpa	name = www.sustech.edu.cn.
3.1.1.1.in-addr.arpa	name = new.sustc.edu.cn.
3.1.1.1.in-addr.arpa	name = webmail.sustc.edu.cn.
3.1.1.1.in-addr.arpa	name = sustech.edu.cn.

# 2.然后通过域名和外网DNS服务器查询外网IP
[root@nginxproxy-01 nginx]# nslookup webmail.sustech.edu.cn 223.5.5.5
Server:		223.5.5.5
Address:	223.5.5.5#53

Non-authoritative answer:
Name:	webmail.sustech.edu.cn
Address: 116.7.234.3

```