As Oracle administrator you can get all supported platforms with the following code:

SET lines 100 pages 999
col platform_name format a35
col endian_format format a13
SELECT platform_name,endian_format,platform_id FROM v$transportable_platform ORDER BY platform_name ASC;


Here a sample out put for an Oracle 11g installation

PLATFORM_NAME                       ENDIAN_FORMAT PLATFORM_ID
----------------------------------- ------------- -----------
AIX-Based Systems (64-bit)          Big                     6
Apple Mac OS                        Big                    16
Apple Mac OS (x86-64)               Little                 21
HP IA OPEN VMS                      Little                 19
HP OPEN VMS                         Little                 15
HP Tru64 UNIX                       Little                  5
HP-UX IA (64-bit)                   Big                     4
HP-UX (64-bit)                      Big                     3
IBM POWER Based Linux               Big                    18
IBM zSeries Based Linux             Big                     9
Linux IA (32-bit)                   Little                 10
Linux IA (64-bit)                   Little                 11
Linux x86 64-bit                    Little                 13
Microsoft Windows IA (32-bit)       Little                  7
Microsoft Windows IA (64-bit)       Little                  8
Microsoft Windows x86 64-bit        Little                 12
Solaris Operating SYSTEM (x86)      Little                 17
Solaris Operating SYSTEM (x86-64)   Little                 20
Solaris[tm] OE (32-bit)             Big                     1
Solaris[tm] OE (64-bit)             Big                     2