create table tb_log
(
  id number,
  name varchar2(100)
);

declare
begin
  for i in 1 .. 100000 loop
    insert into tb_log values (i, i);
    commit;
  end loop;
end;

SQL> select object_id from dba_objects where object_name  ='TB_LOG';

 OBJECT_ID
----------
     70221     

SQL> select dbms_rowid.rowid_create(rowid_type    => 1,
  2                                 object_number => 70221,
  3                                 relative_fno  => file_id,
  4                                 block_number  => block_id,
  5                                 row_number    => 0) begin_rowid,
  6         dbms_rowid.rowid_create(rowid_type    => 1,
  7                                 object_number => 70221,
  8                                 relative_fno  => file_id,
  9                                 block_number  => block_id + blocks,
 10                                 row_number    => 0) end_rowid
 11    from dba_extents t where t.segment_name = 'TB_LOG'
 12  /

BEGIN_ROWID        END_ROWID
------------------ ------------------
AAARJNAAEAAAACwAAA AAARJNAAEAAAAC4AAA
AAARJNAAEAAAAC4AAA AAARJNAAEAAAADAAAA
AAARJNAAEAAAADAAAA AAARJNAAEAAAADIAAA
AAARJNAAEAAAADIAAA AAARJNAAEAAAADQAAA
AAARJNAAEAAAADQAAA AAARJNAAEAAAADYAAA
AAARJNAAEAAAADYAAA AAARJNAAEAAAADgAAA
AAARJNAAEAAAADgAAA AAARJNAAEAAAADoAAA
AAARJNAAEAAAADoAAA AAARJNAAEAAAADwAAA
AAARJNAAEAAAADwAAA AAARJNAAEAAAAD4AAA
AAARJNAAEAAAAD4AAA AAARJNAAEAAAAEAAAA
AAARJNAAEAAAAEAAAA AAARJNAAEAAAAEIAAA

BEGIN_ROWID        END_ROWID
------------------ ------------------
AAARJNAAEAAAAEIAAA AAARJNAAEAAAAEQAAA
AAARJNAAEAAAAEQAAA AAARJNAAEAAAAEYAAA
AAARJNAAEAAAAEYAAA AAARJNAAEAAAAEgAAA
AAARJNAAEAAAAEgAAA AAARJNAAEAAAAEoAAA
AAARJNAAEAAAAEoAAA AAARJNAAEAAAAEwAAA
AAARJNAAEAAAAGAAAA AAARJNAAEAAAAIAAAA

SQL> select count(1) from hxl.tb_log t
    where rowid between 'AAARJNAAEAAAACwAAA'
     and 'AAARJNAAEAAAAIAAAA';

  COUNT(1)
----------
    100000

Declare
  l_Job Number;
Begin
  Dbms_Output.Put_Line('Begin_Rowid' || '------------' || 'End_Rowid');
  For x In (Select Dbms_Rowid.Rowid_Create(1,
                                           Data_Object_Id,
                                           Lo_Fno,
                                           Lo_Block,
                                           0) Min_Rid,
                   Dbms_Rowid.Rowid_Create(1,
                                           Data_Object_Id,
                                           Hi_Fno,
                                           Hi_Block,
                                           10000) Max_Rid
              From (Select Distinct Grp,
                                    First_Value(Relative_Fno) Over(Partition By Grp Order By Relative_Fno, Block_Id Rows Between Unbounded Preceding And Unbounded Following) Lo_Fno,
                                    First_Value(Block_Id) Over(Partition By Grp Order By Relative_Fno, Block_Id Rows Between Unbounded Preceding And Unbounded Following) Lo_Block,
                                    Last_Value(Relative_Fno) Over(Partition By Grp Order By Relative_Fno, Block_Id Rows Between Unbounded Preceding And Unbounded Following) Hi_Fno,
                                    Last_Value(Block_Id + Blocks - 1) Over(Partition By Grp Order By Relative_Fno, Block_Id Rows Between Unbounded Preceding And Unbounded Following) Hi_Block,
                                    Sum(Blocks) Over(Partition By Grp) Sum_Blocks
                      From (Select Relative_Fno,
                                   Block_Id,
                                   Blocks,
                                   Trunc((Sum(Blocks)
                                          Over(Order By Relative_Fno, Block_Id) - 0.01) /
                                         (Sum(Blocks) Over() / 8)) Grp
                              From Dba_Extents
                             Where Segment_Name = Upper('TB_LOG')
                               And Owner = User
                             Order By Block_Id)),
                   (Select Data_Object_Id
                      From User_Objects
                     Where Object_Name = Upper('TB_LOG'))) Loop
  
    Dbms_Output.Put_Line(x.Min_Rid || '----' || x.Max_Rid);
  End Loop;
End;

Begin_Rowid------------End_Rowid
AAAZWuAABAAAX8AAAA----AAAZWuAABAAAX9/CcQ
AAAZWuAABAAAYAAAAA----AAAZWuAABAAAYD/CcQ
AAAZWuAABAAAX0AAAA----AAAZWuAABAAAX1/CcQ
AAAZWuAABAAAX2AAAA----AAAZWuAABAAAX3/CcQ
AAAZWuAABAAAXuIAAA----AAAZWuAABAAAXyHCcQ
AAAZWuAABAAAX4AAAA----AAAZWuAABAAAX5/CcQ
AAAZWuAABAAAX+AAAA----AAAZWuAABAAAX//CcQ
AAAZWuAABAAAX6AAAA----AAAZWuAABAAAX7/CcQ