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Fractional Routing Number on US Checks
US bank checks use a special fractional routing number, which is an alternative notation for the bank's routing number (ABA/RTN). This code is usually printed at the top of the check and has been used in the US banking system for many decades.
Fractional Code Format
The fractional code has the following format:
XXXX/XXXX
It consists of two parts separated by a slash (/) and is directly based on the standard 9-digit routing number (ABA/RTN) of the bank.
How the fractional code is formed
The fractional code is not generated randomly. It is always calculated based on the existing routing number of a specific bank.
1. Numerator (before the / symbol)
The 5th through 8th digits of the routing number are used
The check (9th) digit is not used
Simply put, the central part of the routing number is taken without the checksum.
2. Denominator (after the / character)
The first 4 digits of the routing number are used.
Leading zeros are added if necessary to ensure that the length is always exactly 4 digits.
Example:
Let's say the bank's routing number looks like this:
011000138
Parsing:
First 4 digits (denominator): 0110
Digits 5 through 8 (numerator): 0001
The last 8 is a check digit and is ignored.
Result:
0001/0110
Important Note:
A fractional routing number cannot be "generated" correctly without the bank's actual routing number.
It is always derived from an existing ABA/RTN.
Using random or fictitious fractional codes for real financial transactions is unacceptable.
The fractional code is used primarily to identify the bank on paper checks and in banking documentation, and not for electronic transactions.
(c) Dirlinuxs
US bank checks use a special fractional routing number, which is an alternative notation for the bank's routing number (ABA/RTN). This code is usually printed at the top of the check and has been used in the US banking system for many decades.
Fractional Code Format
The fractional code has the following format:
XXXX/XXXX
It consists of two parts separated by a slash (/) and is directly based on the standard 9-digit routing number (ABA/RTN) of the bank.
How the fractional code is formed
The fractional code is not generated randomly. It is always calculated based on the existing routing number of a specific bank.
1. Numerator (before the / symbol)
The 5th through 8th digits of the routing number are used
The check (9th) digit is not used
Simply put, the central part of the routing number is taken without the checksum.2. Denominator (after the / character)
The first 4 digits of the routing number are used.
Leading zeros are added if necessary to ensure that the length is always exactly 4 digits.
Example:
Let's say the bank's routing number looks like this:
011000138
Parsing:
First 4 digits (denominator): 0110
Digits 5 through 8 (numerator): 0001
The last 8 is a check digit and is ignored.
Result:
0001/0110
Important Note:
A fractional routing number cannot be "generated" correctly without the bank's actual routing number. It is always derived from an existing ABA/RTN. Using random or fictitious fractional codes for real financial transactions is unacceptable.The fractional code is used primarily to identify the bank on paper checks and in banking documentation, and not for electronic transactions.
(c) Dirlinuxs
