check if ip address in fastly public address block

fastly.py

import argparse
import requests
import ipaddress
import sys

parser = argparse.ArgumentParser(description="checks if ip address in fastly ip range")
parser.add_argument("ip", metavar='IP', type=ipaddress.IPv4Address, nargs='+', 
                    help="ip addresses to check")

args = parser.parse_args()

response = requests.get("https://api.fastly.com/public-ip-list").json()
for network_range in response["addresses"]:
    network = ipaddress.ip_network(network_range)
    for ip in args.ip:
        if ip in network:
            print(f"{ip} in fastly network: {network}")
            sys.exit(1)

print(f"{ip} not in fastly public address block")