SELECT rowid,
       DBMS_ROWID.Rowid_object(ROWID) "OBJECT",
       DBMS_ROWID.Rowid_relative_fno(ROWID) "FILE",
       DBMS_ROWID.Rowid_block_number(ROWID) "BLOCK",
       DBMS_ROWID.Rowid_row_number(ROWID) "ROW"
  FROM tablename