域名如何查是否备案

import requests
from bs4 import BeautifulSoup

def query_domain_registration(domain):
    url = f"https://beian.miit.gov.cn/publish/query/indexFirst.action"
    params = {
        "keyword": domain,
        "searchType": "1"
    }
    response = requests.get(url, params=params)
    soup = BeautifulSoup(response.text, 'html.parser')
    
    if "未找到" in soup.text:
        return f"域名 {domain} 未备案"
    
    result = soup.find("table", class_="result-list")
    if result:
        info = result.find_all("tr")[1].find_all("td")
        registration_number = info[0].text.strip()
        registrant = info[1].text.strip()
        registration_date = info[2].text.strip()
        return f"域名 {domain} 已备案\n备案号: {registration_number}\n备案主体: {registrant}\n备案时间: {registration_date}"
    else:
        return f"域名 {domain} 备案信息未找到"

# 示例查询
domain = "example.com"
print(query_domain_registration(domain))