Find wacky websites without a second level domain

wacky_domains.py

import requests
from threading import Thread

tlds = [tld for tld in requests.get('https://data.iana.org/TLD/tlds-alpha-by-domain.txt').text.splitlines() if not tld.startswith('#')]

def check_domain(tld):
    r = requests.get(f'https://cloudflare-dns.com/dns-query?name={tld}&type=A', headers={
        'accept': 'application/dns-json'
    })
    data = r.json()
    if data['Status'] == 0 and 'Answer' in data and not data['Answer'][0]['data'].startswith('127.'):
        print(tld)


threads = []

for tld in tlds:
    t = Thread(None, lambda: check_domain(tld))
    t.start()
    threads.append(t)
    if len(threads) > 100:
        for thread in threads:
            thread.join()
        threads = []
for thread in threads:
    thread.join()