Question 1

What is the standard format and length of the NIK input?

Accepted Answer

The National Identification Number (NIK) must consist of exactly **16 digits**. It is a unique, lifelong identifier issued to Indonesian residents, structured based on regional codes (province, regency/city, sub-district), date of birth, and a sequential registration number.

Question 2

How are gender and birth dates encoded within the 16-digit NIK?

Accepted Answer

The 16 digits of a NIK are structured as follows:
* **Digits 1–2:** Province code
* **Digits 3–4:** Regency/City code
* **Digits 5–6:** Sub-district code
* **Digits 7–12:** Date of birth in the format `DDMMYY`. Note that for females, 40 is added to the day value (e.g., `57` instead of `17`).
* **Digits 13–16:** Sequential registration number starting from `0001` (managed to differentiate residents with identical birth dates and domiciles).

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