Which objects are located at the end of the datafile

SELECT  * FROM  (     SELECT       OWNER,       SEGMENT_NAME,       SEGMENT_TYPE,       partition_name,       BLOCK_ID     FROM       DBA_EXTENTS    WHERE       FILE_ID = (            SELECT              FILE_ID            FROM              DBA_DATA_FILES           WHERE              FILE_NAME = '<datafile_name>' )     ORDER BY BLOCK_ID DESC ) WHERE    ROWNUM <= 7 --last 7 rows ;