How often do the first four numbers of a credit card change?
Right now I detect the credit card type based upon the first four numbers of it.
How often do these first four digits change? Is there a service which can interface with ASP.NET that will keep an up to date list of these first four digits and their corresponding institutions?
根据维基百科关于此的文章，此列表的最后一项重大变化是在2007年。即使您对此进行了严格的编码，保持软件最新也不会太具有挑战性。
Sorry to disagree with the other answerers, but the first six digits (not four) of a card number are known as the issuer identifier range. New ranges are FREQUENTLY added or removed to this list. You would typically need to be on a mailing list from the card issuers to even attempt to keep up to date
This document from Barclays (UK) for example shows a number of revisions in the last few months, such as the addition of a 6440-6599 range for Diners card. http://www.barclaycard.co.uk/business/documents/pdfs/bin_rules.pdf
Basically, attempting to identify card from the IIN is tricky at best. It's not clear why you want to identify a card from the IIN, but it typically isnt necessary if you are performing authorization through a payment gateway
At risk of answering your question without answering it, have you seen this? How do you detect Credit card type based on number?
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