_modules/subnet.py

def find(address,netmask):
    ip_address_list=address.split('.')
    ip_address_int=[]

    ip_netmask_list=netmask.split('.')
    ip_netmask_int=[]

    for item in ip_address_list:
        ip_address_int.append(int(item))

    for item in ip_netmask_list:
        ip_netmask_int.append(int(item))

    network = []


    for i in range(4):
        network.append(ip_address_int[i] & ip_netmask_int[i])

    network_list = str(network[0]) + "." + str(network[1]) + "." + str(network[2]) + "." + str(network[3])

    return network_list