在 Python 中，可以使用标准库 socket 提供的功能来实现一个简单的 DNS 查找。以下是一个示例代码，它演示如何使用 socket.gethostbyname 和 socket.gethostbyaddr 实现 DNS 查找：
示例代码：简单的 DNS 查找

import socket

def dns_lookup(domain_name):
    try:
        # 获取域名的IP地址
        ip_address = socket.gethostbyname(domain_name)
        print(f"域名 {domain_name} 的 IP 地址是: {ip_address}")
        return ip_address
    except socket.gaierror as e:
        print(f"无法解析域名 {domain_name}: {e}")
        return None

def reverse_dns_lookup(ip_address):
    try:
        # 获取IP地址的域名
        domain_name = socket.gethostbyaddr(ip_address)
        print(f"IP 地址 {ip_address} 的域名是: {domain_name[0]}")
        return domain_name[0]
    except socket.herror as e:
        print(f"无法解析 IP 地址 {ip_address}: {e}")
        return None

if __name__ == "__main__":
    # 示例：DNS 正向查找
    domain = ""
    ip = dns_lookup(domain)

    # 示例：DNS 反向查找（如果正向查找成功）
    if ip:
        reverse_dns_lookup(ip)

代码解释

    socket.gethostbyname(domain_name):
        用于将域名解析为 IP 地址。
        如果解析失败，会抛出 socket.gaierror 异常。

    socket.gethostbyaddr(ip_address):
        用于通过 IP 地址查找域名（反向 DNS）。
        如果解析失败，会抛出 socket.herror 异常。

示例输出

运行上述代码时的输出可能如下：

域名 的 IP 地址是: 93.184.216.34
IP 地址 93.184.216.34 的域名是:

提示

    如果需要处理更复杂的 DNS 查询（如 MX、TXT 记录等），建议使用第三方库，例如 dnspython，它提供了更强大的 DNS 查询功能。

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