CRC-CCITT CRC-16 with initial value FFFF

Hello members. Like first i do not have a clue how to do it, but i can tell you what i need it. I need small calculator to calculate checksum for this values:
AF 26 50 D9 where F1 EF is checksum.
Someone on one forum told me that this checksum is calculated by CRC-CCITT CRC-16 with initial value FFFF
I am found some calculators on websites as this ones:
http://ift.tt/PfdgQF
http://ift.tt/1Jzrk1j
I tried but no success. If you need more...

CRC-CCITT CRC-16 with initial value FFFF

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