ip备案域名查询

IP备案域名查询是指通过输入一个IP地址，来查询这个IP地址下有哪些域名已经备案了。这项技术常用于网络安全领域，可以帮助企业和个人辨别是否存在恶意网站或违规网站。以下是一些代码示例，供初学者参考：

1. Python 代码示例：

import requests

def get_domain_by_ip(ip):
    url = 'http://api.ip138.com/query/?ip=' + ip
    headers = {'token': 'your_token_here'}
    r = requests.get(url, headers=headers)
    result = r.text.split(',')
    if len(result) > 2:
        return result[2]
    else:
        return 'None'

ip = '8.8.8.8'  # example IP address
print(get_domain_by_ip(ip))  # output: google-public-dns-a.google.com

2. PHP 代码示例：

function get_domain_by_ip($ip) {
  $url = "http://apidata.chinaz.com/API/IP/?ip=" . $ip;
  $result = file_get_contents($url);
  preg_match_all('/domain:(.*)/', $result, $matches);
  if (isset($matches[1][0])) {
    return trim($matches[1][0]);
  } else {
    return 'None';
  }
}

$ip = '8.8.8.8';  // example IP address
echo get_domain_by_ip($ip);  // output: dns.google

3. Java 代码示例：

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class DomainFinder {
  public static String getDomainByIP(String ip) throws Exception {
    String url = "http://api.ip138.com/query/?ip=" + ip;
    URL obj = new URL(url);
    HttpURLConnection con = (HttpURLConnection) obj.openConnection();
    con.setRequestMethod("GET");
    con.setRequestProperty("token", "your_token_here");
    BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
    String inputLine;
    StringBuffer response = new StringBuffer();
    while ((inputLine = in.readLine()) != null) {
      response.append(inputLine);
    }
    in.close();
    String[] result = response.toString().split(",");
    if (result.length > 2) {
      return result[2];
    } else {
      return "None";
    }
  }
  
  public static void main(String[] args) throws Exception {
    String ip = "8.8.8.8";  // example IP address
    System.out.println(getDomainByIP(ip));  // output: google-public-dns