Australia CRN Generator
Customer Reference Number (CRN - Centrelink / Services Australia) generator for welfare and benefits QA.
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About the Customer Reference Number (CRN)
The Customer Reference Number (CRN) is a 9-digit plus 1-letter identifier issued by Services Australia to access welfare, pensions, and social support services via Centrelink.
It is required for Australian government payments such as JobSeeker, Family Tax Benefit, Age Pension, and Child Care Subsidy.
Anatomy & Structure of CRN (Customer Reference Number)
The Centrelink Customer Reference Number consists of 9 digits and 1 check letter:
| Position | Field | Length | Meaning & Rule | Example |
|---|---|---|---|---|
| 1 to 9 | Base Registration Number | 9 digits | Individual welfare and social services registration number | 123456789 |
| 10 | Check Letter | 1 letter | Checksum letter calculated via weighted Modulo 11 and mapped to alphabet | A |
Official CRN Algorithm (Services Australia Modulo 11)
Check letter calculation for Centrelink CRN:
S = Σ d[i] * (10 - i) (i=0..8); R = S mod 11; Letter = alphabet[R]
- 1. Multiply the 9 digits by decreasing weights from 10 to 2.
- 2. Sum all products into total S.
- 3. Compute remainder R = S mod 11.
- 4. Map remainder to corresponding alphabetic check letter.
- 5. CRN is valid if 10th character matches the calculated letter.