Angola INSS Insured Worker Validator
Online validator for Angola INSS Insured Worker Number (Segurado). Mathematical check digit (Modulo 11) verification.
About INSS Insured Validation
The Segurado Number at INSS Angola identifies individual workers in the social security scheme. This validator checks the structural and mathematical authenticity of the ID.
Validation applies the official Modulo 11 checksum (weights 9 to 2), strictly rejecting corrupted check digits and repeated digit sequences.
Angola INSS Insured Number Structure
Breakdown of the 9-digit INSS worker identification code:
| Position | Field | Length | Meaning & Rule | Example |
|---|---|---|---|---|
| 1 and 2 | Registration Series | 2 digits | Worker registration prefix within the INSS registry | 00 |
| 3 to 8 | Individual Registration | 6 digits | Sequential worker registration number assigned by the INSS | 123456 |
| 9 | Check Digit (DV) | 1 digit | Verification digit computed via Modulo 11 with weights 9 to 2 | 4 |
Check Digit Calculation (Modulo 11)
Mathematical algorithm defined by INSS Angola regulations:
Sum = Σ(digit[i] × weight[i]) for i from 0 to 7, with weights [9, 8, 7, 6, 5, 4, 3, 2]. Remainder = Sum % 11. If Remainder < 2, DV = 0; else DV = 11 - Remainder.
- 1. Multiply each of the first 8 digits by weights descending from 9 to 2.
- 2. Sum the products together.
- 3. Compute the remainder of dividing the sum by 11.
- 4. If remainder is 0 or 1, the check digit is 0. Otherwise, the check digit is 11 minus the remainder.