gceips.py

#!/usr/bin/env python
# gceips.py - A script to print the cidr ranges of all of GCE.
# https://cloud.google.com/compute/docs/faq#where_can_i_find_short_product_name_ip_ranges

import re
# pip install dnspython
import dns.resolver
from dns.rdatatype import TXT

includesmatch = re.compile(r'include:([\w\.-]*)')

includes = []
includesquery = dns.resolver.query('_cloud-netblocks.googleusercontent.com', TXT)
for record in includesquery.rrset.items:
    includes.extend(includesmatch.findall(record.__str__()))

# Write me a regex to match an IP address.
cidrs = []
ipmatch = re.compile(r'ip4:([\d\./]*)')
for group in includes:
    includequery = dns.resolver.query(group, TXT)
    for record in includequery.rrset.items:
        cidrs.extend(ipmatch.findall(record.__str__()))

for cidr in cidrs:
    print('    "%s",' % cidr)