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ABA Routing Number Checker & Validator
Free ABA routing number checker to validate US bank routing numbers instantly. Confirm 9-digit length, verify the checksum, and catch common errors.
How to use this tool
- Enter a routing number; non-digit characters are stripped automatically.
- Review validity status, checksum explanation, and prefix context.
- Copy or download the structured validation report for audit workflows.
What this validates
- Exact 9-digit length requirement for ABA routing numbers.
- Checksum math using the 3-7-1 weighted algorithm.
- Prefix classification for common routing symbol ranges.
What this does not validate
- Live institution status or participation in specific payment rails.
- Account-level pairing between routing and account numbers.
- Wire/ACH destination policy differences across banks.
FAQ
- Does checksum pass mean the bank account is active?
- No. It confirms structural routing-number validity only, not account or institution activity.
- Why are spaces allowed in the input field?
- Formatting improves readability; validation always runs against normalized digits.
- Can I export validation output?
- Yes. Use copy/download report actions to capture machine-readable results.
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