idcheckVerify Missouri driver's licenses
Capture a Missouri license front and back and idcheck.now decodes the AAMVA PDF417 barcode, validates the optional letter + 5–9 digits + optional letter (several legacy layouts in circulation) license number including its birthdate-derived trailing digits, and cross-checks every encoded field against the printed card.
Every layer we run on a Missouri license
These checks run on every Missouri verification — no per-feature upsell on the core flow.
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AAMVA PDF417 decode
Full CDS v01–v12 parse of the Missouri barcode — decoded live in the browser and again independently server-side. Any mismatch is a tamper signal.
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Mandatory-field enforcement
DCS, DAC, DBB, DBA, DAQ, and address elements must be present and well-formed per the AAMVA CDS.
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DOB digit check
The trailing three digits of the Missouri number are recomputed as 63 × birth month + 2 × day (+1 for females) and compared to the DAQ field.
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Barcode ↔ OCR cross-check
Encoded fields are compared against the printed visual zone — name, DOB, expiry, and license number must agree.
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Expiry & age validation
DBA (expiration) is enforced against the validity window; DBB (birth date) drives per-session age thresholds.
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Issuing-authority IIN check
The issuer identification number in the barcode header is checked against Missouri's AAMVA issuer record.
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DMV verification (DLDV add-on)
Missouri participates in AAMVA DLDV — a live check of license number, name, and DOB against the state DMV record, enableable as an add-on.
The Missouri license-number format
optional letter + 5–9 digits + optional letter (several legacy layouts in circulation)The barcode's DAQ element carries the license number. idcheck.now validates it against the published Missouri pattern as a plausibility signal — formats drift over time and legacy cards remain in circulation, so a format miss is a warning fed into the composite score, not an automatic decline.
For Missouri, this is only the first step: the number is also recomputed from the holder's identity — see the deep dive below.
Missouri license numbers end with a birthdate check digit
… N N N (trailing 3 digits)Missouri has several license-number layouts in circulation, but across them the trailing three digits are derived from the holder's birthdate: 63 × month + 2 × day, with 1 added for female holders. An April 23rd birthday encodes as 63×4 + 2×23 = 298 for a male and 299 for a female.
idcheck.now recomputes the expected trailing digits from the barcode's DBB (date of birth) field and compares them to the actual DAQ license number. It's a partial check — the leading characters aren't publicly derivable — but a mismatch is a reliable forgery indicator.
What the Missouri PDF417 barcode tells us
A sample of the AAMVA CDS elements decoded from every Missouri barcode, and what each one feeds into.
| Element | Meaning | How idcheck.now uses it |
|---|---|---|
DAQ |
Customer ID / license number | The license number itself — validated against the state format and, for FL/IL/WI/MO, recomputed from the holder's identity. |
DCS |
Customer family name | Mandatory. Soundex-encoded into the license number in FL/IL/WI; cross-checked against the printed card everywhere. |
DAC |
Customer first name | Mandatory. Mapped to a first-name code (Gallian table) inside FL/IL/WI license numbers. |
DBB |
Date of birth | Mandatory. Encoded into the FL/IL/WI day-code segment and the Missouri trailing digits; drives age checks. |
DBA |
Document expiration date | Mandatory. Enforced against the document validity window on every verification. |
AAMVA DLDV for Missouri
Missouri participates in AAMVA's DLDV program. As an add-on, idcheck.now can submit the license number, name, and date of birth to the Missouri DMV through DLDV and return the state's own verdict — the strongest confirmation short of an in-person check.
Most US jurisdictions participate in DLDV; participant lists and response fields change over time. Confirm availability for Missouri at integration time.
FAQ
Missouri verification questions
What format is a Missouri driver's license number?
Missouri driver's license numbers are optional letter + 5–9 digits + optional letter (several legacy layouts in circulation). idcheck.now validates the barcode's DAQ field against this pattern on every verification; older card layouts still in circulation are handled as plausibility warnings rather than hard failures.
Does idcheck.now check Missouri license numbers against the holder's birthdate?
Yes. Missouri license numbers end with three digits equal to 63 × birth month + 2 × birth day, plus 1 for female holders. idcheck.now recomputes the expected trailing digits from the barcode's DBB date-of-birth field and flags any mismatch against the DAQ license number.
Verify Missouri licenses in your onboarding flow today.
Your first 100 verifications are free. No credit card — five lines of JavaScript.