A Python script to fetch a current list of top-level domains from IANA.

domains.py

import requests
import json

def getDomainList():
    url = "http://data.iana.org/TLD/tlds-alpha-by-domain.txt"
    r = requests.get(url)
    s = r.text.split("\n")
    date =  s[0].split("Last Updated ")[1]
    
    js = {}
    clean_list = []
    
    for dude in s[1:]:
        if dude != "":
            clean_list.append(dude.lower().strip())
    
    js['updated_date'] = date
    js['domains'] = clean_list
    
    return json.dumps(js)