ABA Routing Number check digit for US bank identification. 9-digit code using weighted modulo-10 algorithm with weights 3,7,1 repeating. Found on checks for ACH transfers, wire transfers, and direct deposits. Administered by American Bankers Association.
| Property | Value |
|---|---|
| Category | Checksums |
| Sub-category | Banking Identifier |
| Security status | 🎓 Educational Only |
| Complexity | Beginner |
| Inventor | American Bankers Association |
| Year | 1910 |
| Origin | 🇺🇸 United States |
| Source | algorithms/checksum/aba-routing.js |
Status: 🎓 Educational Only
No vulnerabilities are recorded for this implementation.
3 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.
Vector 1 — JP Morgan Chase (021000021)
| Field | Value |
|---|---|
input |
3032313030303032 |
expected |
01 |
Vector 2 — Routing number 026000013
| Field | Value |
|---|---|
input |
3032363030303031 |
expected |
03 |
Vector 3 — Routing number 121000028
| Field | Value |
|---|---|
input |
3132313030303032 |
expected |
08 |