get_all_private_addrs

from ipaddress import ip_address
from netifaces import (
    interfaces, ifaddresses, AF_INET,
    )


def get_all_private_ips(address_family=AF_INET):
    res = []
    for interface in interfaces():
        addresses = ifaddresses(interface)
        for addr in addresses.get(address_family, []):
            addr = ip_address(addr['addr'])
            if addr.is_private and not addr.is_loopback:
                res.append(str(addr))
    return res