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ABA Routing Number Validator

Check a 9-digit US bank routing number with the ABA checksum.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: Checksum: 3×(d1+d4+d7) + 7×(d2+d5+d8) + (d3+d6+d9) must be a multiple of 10. Format check only.

How to use it (step by step)

  1. 1Fill in the boxes: “Routing number”. Example numbers are already there so you can see how it works; replace them with yours.
  2. 2The result updates instantly as you type (on a phone it is below the boxes).
  3. 3The bold line is the main answer. Tap Copy next to any value to copy it.

Words to know

Routing number
A 9-digit number that identifies a US bank.
Hash / fingerprint (SHA-256)
A short code calculated from a file or text. Change even one letter and the code becomes completely different, so it proves nothing was altered.

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