How to check Card Type that swaped

[Tusshark]

hi
Actually , in my side encryption and decryption of card details or track1 and track2 details is correct.
but after decryption process i am unable to find out which card is swiped . So please give me the resolution for that how i am verify card type from decrypted track1 or track2 details.

[sgbj]

Track 2 contains the credit card number, and a standard way of determining the card type is based on the first 6 digits of the card number. See this answer on StackOverflow.