Thanks Volker that is awesome!

For all who want even more comfort I placed Volkers code in a procedure:

CREATE PROCEDURE "DBA"."GetDBPageObject"( IN nPageNr bigint)

on exception resume

BEGIN

    declare nDbSpaceID int = 0;


   select table_id, table_name, table_page_count, ext_page_count,
      substr(tab_page_list, nPageNr + 1, 1) as uses_page_as_tab_page,
      substr(ext_page_list, nPageNr + 1, 1) as uses_page_as_ext_page,
      null as phys_index_id, null as index_name, null as llen, NULL  as uses_page_as_idx_page
   from sys.systab ST
   where dbspace_id = nDbSpaceID
      and (uses_page_as_tab_page = '1' or uses_page_as_ext_page = '1')
    union 
  select SPX.table_id, table_name, null as table_page_count, null as ext_page_count, null as uses_page_as_tab_page, null as uses_page_as_ext_page, SPX.phys_index_id, index_name,
      len(allocation_bitmap) as llen,
      substr(allocation_bitmap, nPageNr + 1, 1) as uses_page_as_idx_page
   from sys.systab ST
      inner join sys.sysphysidx SPX on ST.table_id = SPX.table_id
      inner join sys.sysidx SIX
         on SPX.table_id = SIX.table_id and SPX.phys_index_id = SIX.phys_index_id
   where SIX.dbspace_id = nDbSpaceID
      and uses_page_as_idx_page = '1';

END;