Pretty simple just go to settings-general-about and find your firmware
iPod touch
2nd Gen 4.2.1 greenposi0n models: 8g 16g 32g 64g no camera
3rd Gen 4.2.1 greenposi0n models: only 32g and 64g no camera
1gen iPod touch not supported.
4th gen 4.3.2 Redsnow 0.9.6rc14
iPhones
3GS 4.2.1 greenposi0n
IPhone 4.3.2 Redsn0w 0.9.6rc14
Dfu mode: similar to recovery mode, only the connect to iTunes logo does not popup
iPod touch
2nd Gen 4.2.1 greenposi0n models: 8g 16g 32g 64g no camera
3rd Gen 4.2.1 greenposi0n models: only 32g and 64g no camera
1gen iPod touch not supported.
4th gen 4.3.2 Redsnow 0.9.6rc14
iPhones
3GS 4.2.1 greenposi0n
IPhone 4.3.2 Redsn0w 0.9.6rc14
Dfu mode: similar to recovery mode, only the connect to iTunes logo does not popup