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.