CUIL Validator

CUIL (Argentine labor ID) · Issuer: ANSES. Payroll, social security registrations, digital pay slips and HR systems.

Format

11 digits, XX-XXXXXXXX-X. Prefixes 20 (male), 27 (female), 23/24 when the calculation collides. The middle 8 digits are the DNI.

Check-digit algorithm

1. Same mod 11 as CUIT: weights 5,4,3,2,7,6,5,4,3,2 over the first 10 digits.
2. Check digit = 11 − (sum mod 11); 11 → 0.
3. If the result is 10, ANSES switches to prefix 23 and recalculates.

Use cases

Payroll, social security registrations, digital pay slips and HR systems.

Code examples

# curl (RapidAPI)
curl -X POST "https://validalatam.p.rapidapi.com/validate" -H "Content-Type: application/json" \
  -H "X-RapidAPI-Key: $RAPIDAPI_KEY" -H "X-RapidAPI-Host: validalatam.p.rapidapi.com" \
  -d '{"type":"AR_CUIL","value":"27191984019"}'

# Python
import requests
r = requests.post("https://validalatam.p.rapidapi.com/validate", json={"type": "AR_CUIL", "value": "27191984019"},
                 headers={"X-RapidAPI-Key": KEY, "X-RapidAPI-Host": "validalatam.p.rapidapi.com"})
print(r.json()["valid"], r.json()["formatted"])

// JavaScript (fetch)
const r = await fetch("https://validalatam.p.rapidapi.com/validate", { method: "POST",
  headers: { "Content-Type": "application/json", "X-RapidAPI-Key": KEY, "X-RapidAPI-Host": "validalatam.p.rapidapi.com" },
  body: JSON.stringify({ type: "AR_CUIL", value: "27191984019" }) });
const { valid, formatted, error } = await r.json();

# Response
{
  "valid": true,
  "type": "AR_CUIL",
  "country": "AR",
  "input": "27191984019",
  "normalized": "27191984019",
  "formatted": "27-19198401-9"
}

API plans on RapidAPI

Free plan to get started; paid plans for production volume and batch validation (up to 1000 per request).

See plans on RapidAPI →

FAQ

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