US Routing Number Generator
United StatesGenerate valid-format US ABA routing transit numbers with correct check digits for testing. Routing numbers are 9-digit codes used to identify financial institutions.
Generator
Validate Routing Number
ABA Routing Number Format
Length: 9 digits
Structure: XXXXYYYYC
XXXX: Federal Reserve routing symbol
YYYY: ABA institution identifier
C: Check digit (mod 10)
Federal Reserve Districts
Testing Only
These are randomly generated numbers for testing purposes only. Do not use for actual financial transactions.
What is This Tool?
A routing number generator creates realistic ABA routing transit numbers — the 9-digit codes used to identify US financial institutions for ACH transfers, wire transfers, and check processing. Generated numbers include valid check digits calculated using the ABA algorithm.
ABA routing numbers use a weighted checksum: 3×(d1+d4+d7) + 7×(d2+d5+d8) + 1×(d3+d6+d9) must be divisible by 10. The first two digits indicate the Federal Reserve district (01-12), and digits 3-4 identify the Fed office. This generator produces structurally valid routing numbers.
Common Use Cases
ACH Integration Testing
Test ACH payment origination, direct deposit setup, and bank transfer workflows with valid-format routing numbers.
Banking Software QA
Validate routing number input fields, check digit verification, and bank lookup features.
Payroll Systems
Test employee direct deposit enrollment, payroll processing, and bank account verification flows.
Wire Transfer Testing
Validate domestic wire transfer forms and routing number verification in banking applications.
Frequently Asked Questions
Are generated routing numbers real banks?
Numbers follow correct ABA format with valid check digits but may not correspond to actual financial institutions. They are for testing only.
How is the check digit calculated?
Using the ABA weighted checksum: multiply alternating digits by 3, 7, and 1, sum all products, and the total must be divisible by 10.
What do the digits mean?
Digits 1-2: Federal Reserve district. Digits 3-4: Fed processing center. Digits 5-8: Financial institution. Digit 9: check digit.