RRN generator (South Korea)
A South Korean RRN is thirteen digits — date of birth, a sex/century digit, a serial, and a MOD-11 check digit. These test values are synthetic but checksum-valid (legacy scheme; numbers issued since 2020 randomise the tail).
Synthetic RRN with a valid legacy check digit. Not a real issued number.
Format specification
| Identifier | Resident Registration Number (RRN) |
|---|---|
| Country | 🇰🇷 South Korea |
| Format | 000000-0000000 |
| Length | 13 characters |
| Checksum | MOD 11 |
| Example | 710427-1363357 |
| Safe strategy | Synthetic |
| Data quality | Best-effort |
Resident Registration Number: what each part means
| 000000 | Date of birth as YYMMDD. |
|---|---|
| 0 | Sex and century in one digit: 1/2 = born 1900s (male/female), 3/4 = 2000s, 9/0 = 1800s; 5–8 are used for foreign residents. |
| 00000 | On pre-2020 numbers this encoded the registration region and a serial; numbers issued since October 2020 randomise these digits entirely. Test values use random digits. |
| 0 | MOD-11 check digit of the legacy scheme (numbers issued since October 2020 no longer guarantee it). |
Validation regex
Matches the canonical value — strip separators and uppercase first: value.replace(/[^A-Za-z0-9]/g, '').toUpperCase()
^\d{13}$ References
Common questions
Will these pass my validation?
Yes — they are well-formed Resident Registration Number values (000000-0000000) and pass standard format checks, including the MOD 11 checksum.
Could one belong to a real person?
These are synthetic values. They are format-valid but not drawn from a guaranteed reserved range, so use them only for testing.
Can I generate many at once?
Increase the count, or use the free API and CSV/JSON export for large datasets.