从域数据库中过滤过期域和注册域

Question

我有一个包含 100 万个域的数据库中的域列表。 我使用下面的 python 代码过滤掉两个不同 .csv 文件中当前注册的域和过期的域。

但是当我向域名注册商查询时，注册域名列表中大约 15-20% 的域名已过期。

我正在考虑如何进一步改进我的代码。 在 whois 测试之后加入 ping 测试会提高准确性吗？

非常感谢建议...

import requests
import whois
import csv    
from csv import reader
import concurrent.futures
import tldextract

AllDomains = []

with open('raw-domains.csv', 'r') as f:
    reader = csv.reader(f)
    for row in reader:
        AllDomains.append(row[0])

def filterdomains (domainname):

        try:
            a=(tldextract.extract(domainname))
            host = a.registered_domain
            res = whois.whois(host)  # Check Whois info.

# save domain as registered if whois info found            
            with open('Registered-domains.csv', 'a', encoding="utf-8", newline='') as myfile:   
                        writer = csv.writer(myfile)
                        writer.writerow([host])
            print(host+"--Registered")
               
        except whois.parser.PywhoisError:

# save domain as expired if whois info is not available
            with open('Expired-domains.csv', 'a', encoding="utf-8", newline='') as myfile:  
                        writer = csv.writer(myfile)
                        writer.writerow([host])
            print(host+"--Expired")
                        
with concurrent.futures.ThreadPoolExecutor(max_workers=20) as executor:
        executor.map(filterdomains, AllDomains)