def validate(self, value):
        """
        Accepts: str, unicode
        Returns: list of tuples in the format (ip, port)
        """
        val = super(SlavesValue, self).validate(value)

        slaves = val.replace(" ", "")
        slaves = filter(None, slaves.split(','))
        slaves = [x.split(":") for x in slaves]
        res = list()
        for x in slaves:
            self._validate_ip(x[0])
            if len(x) == 1:
                res.append((x[0], 53))
            else:
                res.append((x[0], int(x[1])))
        return res