Hi Mohammmed,
Here is the list:-
Cisco 800, 1700, 2600 = Yes
Cisco 1800, 2800, 3800 =Yes
Cisco 4500 = Yes
Cisco 6500 = Yes
Cisco7200, 7300, 7500 = Yes
Cisco 7600 = Yes
Cisco 10000, 12000, CRS-1 =Yes
Cisco 2900, 3500, 3660, 3750 = Not supported
Standalone or stackable switches do not support NetFlow. This means Catalyst 4948, Catalyst 3750 or Catalyst 3560 series switches do not support NetFlow. You can see the necessary commands on config mode but they are not effective. It is not about IOS version or feature set. You need a modular switch for NetFlow.
Hope this helps.