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We are not sure that all the formats which we have discussed here are correct because time to time a company can change their numbering format.
You can easily change a format with simply modify the regular expression which we have used for various cards.
If the MII is 9, the next three digits of the issuer identifier are the 3-digit country codes defined in ISO 3166, and the remaining final two digits of the issuer identifier can be defined by the national standards body of the specified country in whatever way wished.
The first few digits can always be used to identify the credit card type.
There are various companies in financial market offer credit cards.
But there is no common format in the credit card numbering system, it varies company to company.
This verification does not tell you if funds are available in the account and it certainly doesn't tell whether or not the person submitting the order is committing credit card fraud.
The following information comes from my experience in working with electronic commerce for more than 15 years. Let's look at a credit card number so that you have visual context.
The first digit is called the Major Industry Identifier or MII.
It also differs from Universal Payment Identification Code, another identifier for a bank account in the United States.
The leading six digits of the card number is the "issuer identification number (IIN)", sometimes referred to as the "bank identification number (BIN)".