Just to not confuse anyone: This is part 2 of the guide of checking BINs which I accidentally deleted and will publish later. So this doesn't cover the specific approach of checking the BIN, but a trick to check as much BINs as possible without using a valid card. I wrote this since tons of newcomers mistakenly think that they need to actually buy a bunch of card to test which BIN is VBV/3DS and which isn't.