CIDR compatible INTERNAL_IPS with Python 3 Standard Library

from collections import Iterable
from ipaddress import IPv4Address, IPv4Network

class IpList(object):
    def __init__(self, addresses):
        self.addresses = [IPv4Network(address) if isinstance(address, Iterable) else IPv4Address(address) for address in addresses]

    def __contains__(self, ip):
        ip = IPv4Address(ip)
        for address in self.addresses:
            if isinstance(address, IPv4Address):
                if ip == address:
                    return True
            if isinstance(address, IPv4Network):
                if ip in address:
                    return True
        return False

INTERNAL_IPS = IpList([
    '127.0.0.1',
    '192.168.0.0/24'
    ])