Check if IP address belongs to Cloudflare

check_cloudflare_ips.py

import requests
import ipaddress

# Get Cloudflare IP Ranges 
# ref: https://www.cloudflare.com/ips/
def get_cf_ips():
    ips = []
    for urls in [
        "https://www.cloudflare.com/ips-v4",
        "https://www.cloudflare.com/ips-v6"
    ]:
        res = requests.get(urls)
        for ip in res.text.split("\n"):
            ips.append(ipaddress.ip_network(ip))

    return ips


ip = "8.8.8.8" # just an example
cf_ips = get_cf_ips()

# True if "ip" belongs to Cloudflare
print(any([ipaddress.ip_address(ip) in cf_ip for cf_ip in cf_ips()]))