find-aws-region.py

#!/usr/bin/env python3

# https://stackoverflow.com/questions/45441865/determine-aws-region-from-ip-address
from ipaddress import ip_network, ip_address
import requests
import sys

def find_aws_region(ip):
    url = 'https://ip-ranges.amazonaws.com/ip-ranges.json'
    ip_json = requests.get(url).json()
    prefixes = ip_json['prefixes']
    my_ip = ip_address(ip)
    for prefix in prefixes:
      if my_ip in ip_network(prefix['ip_prefix']):
        return prefix['region']
    return 'Unknown'

if __name__ == '__main__':
    print(find_aws_region(sys.argv[1]))