Why is the control block not verified?

NIDA does not publish a check-digit algorithm, so this tool validates the 20-digit length and the embedded date of birth but cannot verify the final control block.

Is my NIDA number sent anywhere?

No. The validator is privacy-first. All processing happens locally in your browser with no network requests — your number never leaves your device and is never checked against the NIDA database.

Tanzania NIDA Number Validator & Decoder

Q: What does a NIDA NIN contain?

A NIDA NIN is 20 digits, conventionally YYYYMMDD-NNNNN-NNNNN-NN. The first 8 digits are the date of birth, followed by a registration-centre block, an applicant serial block and a trailing control block.

Tanzania NIDA number validator

Validate a Tanzanian NIDA National Identification Number (NIN) and decode its embedded date of birth. The NIN is 20 digits, conventionally written as YYYYMMDD-NNNNN-NNNNN-NN: the first 8 digits are the date of birth, followed by a registration-centre block, an applicant serial block and a trailing control block.

NIDA does not publish a check-digit algorithm, so the deterministic offline checks are the 20-digit length and a valid embedded date of birth.

Privacy-first: everything runs in your browser with no network requests. This tool decodes the structure only — it cannot confirm a NIN against the NIDA database.