ec2 subnet address allocation script

subnet_address_alloc.py

import boto.ec2
import boto.vpc

def subnet_stats(subnet_id):
    addresses = []
    ints = ec2.get_all_network_interfaces(filters={'subnet-id': subnet_id})
    for i in ints:
        addresses.append(i.private_ip_address)
        for addr in i.private_ip_addresses:
            if addr.private_ip_address != i.private_ip_address:
                addresses.append(addr.private_ip_address)
    addresses.sort(lambda x, y: 1 if int(x.split('.')[-1]) > int(y.split('.')[-1]) else -1)
    print "\tNumber of allocated addresses: %d" % len(addresses)
    print "\tAddresses left: %d" % (254 - int(len(addresses)))
    print "\tAddresses: %s\n" % addresses

ec2 = boto.ec2.connect_to_region('us-west-1')
vpc = boto.vpc.connect_to_region('us-west-1')
subnets = vpc.get_all_subnets()
for subnet in subnets:
    print "Stats for subnet \"%s\" (%s):" % (subnet.tags['Name'], subnet.id)
    print "\tAZ: %s" % subnet.availability_zone
    print "\tCIDR: %s" % subnet.cidr_block
    subnet_stats(subnet.id)