Quick and dirty method to find an IP on a private network given a correctly
    formatted IPv4 quad.

def priv(x): 
    """
    Quick and dirty method to find an IP on a private network given a correctly
    formatted IPv4 quad.
    """
    if x.startswith(u'172.'):
        return 16 <= int(x.split(u'.')[1]) < 32
    return x.startswith((u'192.168.', u'10.', u'172.'))