> For the complete documentation index, see [llms.txt](https://close.gitbook.io/yun-wei-bi-ji/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://close.gitbook.io/yun-wei-bi-ji/python/python-xiao-ji-qiao/dnspython-shi-xian-ns-ji-lu-cha-xun.md).

# dnspython实现NS记录查询

```python
pip install dnspython
```

> query(self, qname, rdtype = 1, rdclass = 1, tcp = False, source = None,raise\_on\_no\_answer = True, source\_port = 0)
>
> qname参数为查询的域名，
>
> rdtype参数用来指定RR资源。
>
>  A记录：将主机名转换成IP地址 
>
> MX记录：邮件交换记录，定义邮件服务器的域名 
>
> CNAME记录：别名记录，实现域名间的映射 
>
> NS记录：标记区域的域名服务器及授权子域
>
> PTR记录：反向解析，与A记录相反，将IP地址转换为主机名 SOA记录：
>
> SOA标记，一个起始授权区的定义
>
> rdclass指定网络类型，IN，CH，HS， IN默认 tcp指定查询是否启用TCP协议（默认不启用） source 与source\_port指定查询源的地址与端口，默认为查询设备的IP地址和0 raise\_on\_no\_answer指定查询无应答时是否触发异常，默认为True

### 查询NS记录

```python
import dns.resolver

domain = raw_input('Please input an domain: ')
ns = dns.resolver.query(domain, 'NS')
for i in ns.response.answer:
    for j in i.items:
        print(j.to_text())
```

**测试**：

```python
[root@bogon dns]# python NS.py
Please input an domain: baidu.com #智能输入一级域名
ns4.baidu.com.
ns3.baidu.com.
ns2.baidu.com.
dns.baidu.com.
ns7.baidu.com.
```

### 查询A记录

```python
import dns.resolver

domain = raw_input(‘Please input an domain:’)

A = dns.resolver.query(domain, ‘A’)
for i in A.response.answer:
    for j in i.items:
        print(j.address)
```

### 查询 CNAME 记录

* 只限输入一级域名

```python
import dns.resolver

domain = raw_input('please input a domain:')

CNAME = dns.resolver.query(domain,'CNAME')
for i in CNAME.response.answer:
    for j in i.items:
        print(j.to_text())
```

### MX记录

```python
import dns.resolver

domain = raw_input('Please input a domain')

MX = dns.resolver.query(domain, 'MX')

for i in MX:
    print('MX preference =', i.preference, 'mail exchanger =', i.exchange
)
```