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In our consulting business we have gotten more and more requests for NFC integration. Durig these integrations we often need to deal with access blocks for Mifare Classic cards.

The access bits are well described in the documentation but as it is a bit-format it takes time to decode it using pen and pencil. We have not been able to find any online tools to calculate it as well. To help us we made a small widget to calculate the bits, source code is free and available on GitHub.

Please notice that Akafugu does not take any responsibility that the access bits are correct. You should always double check the access bits as there is a real possibility that your card will be unaccessible if you set it wrong.