list all of the IPv4 addresses in an AWS region and provide a summary count

aws-ipv4.py

"""
List & count all IPv4 addresses in an AWS region
"""
import requests

REGION = 'us-east-1'

rsp = requests.get('https://ip-ranges.amazonaws.com/ip-ranges.json')
rj = rsp.json()

print("Here are all of the IPv4 netblocks in %s" % REGION)

acc = 0
for i in rj['prefixes']:
    if i.get('ip_prefix') and i['region'] == REGION:
        range = i['ip_prefix']
        print(range)
        acc += 2 ** (32 - int(range[range.index('/')+1:]))

print("These cover a total of %s IP addresses" % acc)