Fake ABA Routing Number Generator

How to use

1. 1️⃣
   Choose your options above
2. 2️⃣
   Click Generate
3. 3️⃣
   Copy your result

Detailed instructions

1. Set the count field to the number of routing numbers you need, from 1 up to your desired batch size.
2. Select a Federal Reserve District from the region dropdown, or leave it on 'Any' for a geographically mixed set.
3. Click Generate to produce the list of structurally valid fake ABA routing numbers.
4. Copy individual numbers or the full list and paste them directly into your test forms, seed scripts, or mock datasets.

Use Cases

• •Testing ACH payment form validators in Cypress against checksum-passing input without real bank data
• •Seeding a Postgres staging database with 500 structurally valid routing numbers for load-testing a payroll API
• •Verifying Federal Reserve District branching logic by generating numbers scoped to Chicago (07) vs. Dallas (11)
• •Populating Figma fintech prototypes with realistic routing numbers for client demos and investor walkthroughs
• •Unit-testing custom ABA checksum middleware in Jest to confirm the 3-7-1 weighting implementation is correct

Tips

• →Generate at least 20-30 numbers at once when seeding a staging database to avoid routing number collisions in foreign-key constraints.
• →Use district-specific generation when testing bank lookup features — different districts have different valid leading-digit ranges that may trigger separate code paths.
• →Combine these routing numbers with a fake account number generator to build complete, realistic bank account record pairs for integration tests.
• →Store a fixed set of generated routing numbers in your test fixtures rather than regenerating each run, so test assertions remain deterministic.
• →If your validator also checks against a known-bank database, these numbers will correctly fail that lookup — useful for testing the 'unrecognized bank' error path specifically.
• →When writing API documentation or sandbox guides, use numbers from the New York district (02) to mirror the routing format that most readers will recognize from major US banks.

FAQ