Info: Officially a bank account number is 10 numbers long but you’ve probably seen them with just 9 numbers so far, the first (10th number) is a leading zero.īank account numbers apply to a special algorithm called the ‘ 11-proef‘. It’s even more easy because ABN-AMRO uses fixed ranges of account numbers (see this thready for bank account ranges, officially it’s not a given range but let’s say they use the whole 4x.xx.xx.xxx range). ![]() ![]() The bank’s Service Center (0900-0024) will be probably be overloaded, this is the same phone number as being used for payments, stock advice/buying/selling, lost cards, etc. Wrong!, imagine building a script, blocking all account numbers of all internet banking customers. You might think: “Nothing wrong, it’s just one account”. meanwhile he/she cannot enjoy internet banking or online stock trading. The owner of the account needs to call the Service Center (or submit a letter/fax) and request to unlock his/her account. Going to and typing an existing bank account number with any card number, submit this 5 times and the account will be locked. ![]() It’s made too simple to lock an account for internet banking. This article including it’s examples and example code (which will be posted later) are for educational purposes only. Today I took some time to write a little about ABN-AMRO’s security weaknesses.
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