#!/usr/bin/env python
##################################
# pip install netaddr
from netaddr import IPAddress, IPNetwork

file_out = "./internet-connected.csv"
with open(file_out, mode='a+') as f:
    for class_a in range(0, 255):
        a = IPAddress("%s.0.0.0" % class_a)
        if not a.is_reserved():
            for class_b in range(0, 255):
                b = IPAddress("%d.%d.0.0" % (class_a, class_b))
                if not b.is_reserved():
                    for class_c in range(0, 255):
                        c = IPAddress("%d.%d.%d.0" % (class_a, class_b, class_c))
                        if not c.is_reserved() and not c.is_private():
                            ip = "%s/24" % c
                            for host_ip in IPNetwork(ip).iter_hosts():
                                if host_ip.is_unicast():
                                    f.write(str(host_ip) + '\n')