def METHOD_NAME(self, isd_as: ISD_AS) -> str:
    """ Determine the IP used for the end host (client or server) in the given ISD-AS """
    # The address must be the daemon IP (as it makes requests to the control
    # service on behalf of the end host application).
    return self._container_ip("scion_sd%s" % isd_as.file_fmt())