Script to "cheat" at sub-netting.

subnet.py

#!/usr/local/bin/python3

import sys
import ipaddress as ip

def print_help():
    print("Usage: ")
    print("main.py address [computers]\n")
    print("address: must be an IPv4 network address (including netmask in shorthand e.g. 192.168.211.0/27)")
    print("computers: optional - Number of computers on subnet. Will only print first and last host address.")
    exit(0)

def main():
    if len(sys.argv) < 2:
        print_help()
    address = sys.argv[1]
    if len(sys.argv) == 3:
        computers = int(sys.argv[2])
    else:
        computers = -1

    net = ip.IPv4Network(address)
    print("Network Address: {0}".format(net.network_address))
    print("Broadcast Address: {0}".format(net.broadcast_address))
    print("Hostmask: {0}".format(net.hostmask))

    if computers < 0:
        print("Hosts: ")
        for host in list(net.hosts()):
            print(host)
    elif computers <= len(list(net.hosts())):
        hosts = list(net.hosts())
        print("First host: {0}".format(hosts[0]))
        print("Last host: {0}".format(hosts[computers - 1]))
    else:
        print("Invalid number of computers for subnet")

if __name__ == "__main__":
    main()