def tiers_for_dev(dev):
    """
    Returns a tuple of tiers for a given device in ascending order by
    length.

    :returns: tuple of tiers
    """
    t1 = dev['region']
    t2 = dev['zone']
    t3 = dev['ip']
    t4 = dev['id']
    return (t1,), (t1, t2), (t1, t2, t3), (t1, t2, t3, t4)
