Hong Kong HKID Generator
Hong Kong Identity Card (HKID) generator for immigration, financial and banking software testing.
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About Hong Kong Identity Card (HKID)
The HKID is the mandatory official identity card issued to residents of Hong Kong aged 11 and above.
It is widely used for e-Channel border clearance, public services, medical care, and banking.
Anatomy & Structure of Hong Kong HKID
Formatted as L(NNNNNN)C or LL(NNNNNN)C:
| Position | Field | Length | Meaning & Rule | Example |
|---|---|---|---|---|
| 1 (or 1 and 2) | Prefix | 1 or 2 letters | Letters (A-Z) representing issuance category or date era | A |
| 2 to 7 (or 3 to 8) | Serial Number | 6 digits | Sequential number allocated by the Immigration Department | 123456 |
| Final character | Check Character | 1 char | Modulo 11 check character (0-9 or letter "A" for value 10) | 3 |
Official Checksum Algorithm (Weighted Modulo 11)
Official formula defined by Hong Kong Immigration Department:
S = (c1 * 9) + (c2 * 8) + (d1 * 7) + (d2 * 6) + (d3 * 5) + (d4 * 4) + (d5 * 3) + (d6 * 2); Remainder = S mod 11; Check = (11 - Remainder) mod 11.
- 1. For single-letter prefixes, the first slot is an implicit space (value 36) multiplied by weight 9.
- 2. Letters A-Z map to values 10 through 35.
- 3. Multiply characters by descending weights [9, 8, 7, 6, 5, 4, 3, 2].
- 4. Sum the products and find remainder modulo 11.
- 5. Check character is (11 - Remainder) mod 11. If 10, it is represented as letter "A".