Get CIDR of S3 service in us-east-1 region

useast1_s3_ips.py

#!/usr/bin/env python

# Usage:
#   $ python ./useast1_s3_ips.py
#   Update Date: 2018-06-01-12-26-19
#   
#   52.92.16.0/20
#   52.216.0.0/15
#   54.231.0.0/17
#

import urllib2
import json

ip_ranges_file = urllib2.urlopen("https://ip-ranges.amazonaws.com/ip-ranges.json")
ip_ranges_json = json.loads(ip_ranges_file.read())
ip_ranges = ip_ranges_json['prefixes']

create_date = ip_ranges_json['createDate']

print("Update Date: %s\n" % create_date)

# Available Services
# "AMAZON"
# "ROUTE53_HEALTHCHECKS"
# "S3"
# "EC2"
# "ROUTE53"
# "CLOUDFRONT"
# "CODEBUILD"
# "AMAZON_CONNECT"
# "CLOUD9"
# "AMAZON"
# "ROUTE53_HEALTHCHECKS"
# "S3"
# "EC2"
# "CLOUDFRONT"
#
# Get CIDR of S3 service in us-east-1 region
us_east_1_s3_ips = [item['ip_prefix'] \
        for item in ip_ranges \
            if item['service'] == 'S3' and item['region'] == "us-east-1"]

for ip in us_east_1_s3_ips:
    print(ip)