def turn_from_decimal_to_binary(decimal_adress: str) -> str:
    """
    Return binary address from decimal address.

    >>> turn_from_decimal_to_binary("192.168.1.15")
    '11000000.10101000.00000001.00001111'
    """

    numbers = decimal_adress.split('.')
    bin_adress = ''
    for number in numbers:
        bin_num = bin(int(number))
        bin_num = bin_num[2:]
        bin_num = bin_num.zfill(8)
        bin_adress += bin_num
        bin_adress += '.'
    return bin_adress[:-1]