tld_lookup.py

import asyncio
import aiodns

loop = asyncio.get_event_loop()
resolver = aiodns.DNSResolver(loop=loop)

async def lookup(tld, data):
    try:
        data[tld] = await resolver.query(tld, "A")
    except:
        pass

with open("tlds-alpha-by-domain.txt", "r") as d:
    tlds = d.read().split("\n")[::-1][1:][::-1]

data = {}

tasks = []

async def main():
    tasks = []

    for tld in tlds:
        tasks.append(loop.create_task(lookup(tld, data)))

    await asyncio.gather(*tasks)

loop.run_until_complete(main())

for tld, hosts in data.items():
    print(f".{tld}: {list(h.host for h in hosts)}")

Here's a list of TLDs for those who need it: https://data.iana.org/TLD/tlds-alpha-by-domain.txt