ABA Routing Number Validator
Validate US bank ABA routing transit numbers with the mod-10 checksum, Federal Reserve district prefix, and weighted sum breakdown.
What is an ABA routing number?
An ABA routing transit number is a nine-digit code used to identify US financial institutions for ACH transfers, wire payments, and direct deposit. The American Bankers Association checksum uses a weighted mod-10 algorithm so mistyped digits are caught before money moves.
This validator strips non-digits, applies the 3-7-1 weight pattern, and shows the Federal Reserve district implied by the first two digits. Pair it with the IBAN Validator and Parser when you work with international account identifiers.
Frequently Asked Questions
Does a valid checksum prove the bank exists?
No. The checksum only confirms the number is structurally plausible. Always confirm routing details with the receiving institution.
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