Belgian SSIN Management

Manage Belgian Social Security Numbers with Confidence

A comprehensive library for validating, generating, and managing Belgian Social Security Identification Numbers (SSIN) with ease.

Validation

Validate existing SSIN numbers with format checking and checksum verification.

Generation

Create valid SSIN numbers for testing purposes with proper formatting and rules.

Compliant

Follows official Belgian SSIN structure and validation rules accurately.

Understanding SSIN Numbers

The Belgian Social Security Identification Number (SSIN), formerly known as the National Number, is a unique identifier assigned to each citizen. This document explains the structure, rules, and characteristics of SSIN numbers.

Structure

An SSIN consists of 11 digits, typically formatted as: YY.MM.DD-OOO.CC

The number is composed of three main parts:

1. Birth Date (6 digits)

YY: Year of birth (last two digits)
MM: Month of birth
DD: Day of birth

2. Order Number (3 digits)

OOO: A sequence number for people born on the same day
For men: odd numbers from 001 to 997
For women: even numbers from 002 to 998

3. Check Digits (2 digits)

CC: A control number calculated from the previous digits

Gender Determination

The gender of a person can be determined from their SSIN:

If the order number is odd (001, 003, ..., 997), the person is male
If the order number is even (002, 004, ..., 998), the person is female