Rodné číslo generator (Czechia)
A Czechia birth number (rodné číslo) is ten digits — date of birth, a serial, and a check digit that makes the whole number divisible by 11. These test values are synthetic but checksum-valid.
Synthetic · not collision-guaranteed Validate a number →
620115/9921
Synthetic rodné číslo (divisible by 11). Not a real issued number.
Format specification
| Identifier | Rodné číslo (Birth number) |
|---|---|
| Country | 🇨🇿 Czechia |
| Format | 000000/0000 |
| Length | 10 characters |
| Checksum | Mod 11 (÷11) |
| Example | 710427/1361 |
| Safe strategy | Synthetic |
| Data quality | Verified against sources |
Rodné číslo: what each part means
| 00 | Last two digits of the year of birth. |
|---|---|
| 00 | Month of birth, with 50 added for women (so 51–62 means a woman born in month 1–12). These test values use the 01–12 form. |
| 00 | Day of birth. |
| 000 | Serial number distinguishing people born on the same day. |
| 0 | Final digit chosen so the whole ten-digit number is divisible by 11 (the modern post-1954 rule). |
Validation regex
Matches the canonical value — strip separators and uppercase first: value.replace(/[^A-Za-z0-9]/g, '').toUpperCase()
^\d{10}$ References
Common questions
Will these pass my validation?
Yes — they are well-formed Rodné číslo values (000000/0000) and pass standard format checks, including the Mod 11 (÷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.
For software testing only. These numbers are synthetic and must never be used
for real-world identification, applications, or to impersonate anyone.