What Is An ABA Routing Number Check Digit?
A check digit is a form of redundancy check used for error detection for many algorithm generated numbers such as ABA Routing Numbers, Credit Card Numbers, etc. but for our purposes here, refers to ABA Routing Numbers created by the American Banking Association. Basically, it is the decimal equivalent of a binary checksum and really has nothing to do with a written Check at all. It consists of a single digit computed from the other digits in the ABA Routing Number. Often, the last number of a 9 digit ABA Routing Number is missing, either cut off from electronic transmission, or missed during entering. There is a special algorithm you can use to identify that missing number by simply using the first 8 digits of a known ABA Routing Number. To learn more, and to obtain your own ABA Routing Numbers List or Missing Check Digit Tool is a simple matter – Click Here.
