Home Rodné číslo Slovakia
Slovakia Rodné číslo validator
How the Rodné číslo format works
- Format
- 9 or 10 digits
- Example
- 8352121239
Things to watch for
- Uses the same check as Czechia's rodné číslo: 10-digit numbers are valid when the full number divides evenly by 11 (with a narrow 1954-1985 historical exception); 9-digit numbers, issued before 1954, carry no check digit and are accepted on format alone
- Written with a slash (YYMMDD/SSSS) which this tool's normalization strips before checking — enter it with or without the slash
- The first 6 digits encode a date of birth (month offset by 50 for women) — we validate format and checksum only, never the date, and never store what you enter
^[0-9]{9,10}$A rodné číslo (birth number) is Slovakia’s national identifier, issued to residents and used across tax, health insurance, banking, and most official paperwork. Slovakia inherited the numbering scheme from Czechoslovakia, which introduced it in 1954, and kept it unchanged when the country split into the Czech Republic and Slovakia in 1993 — so Slovak and Czech rodné čísla follow exactly the same 10-digit structure and check rule, even though the two states have run entirely separate population registers, each administered by its own authorities, ever since the split.
That check rule is unusual among the identifiers covered on this site: rather than a weighted check digit computed and appended, a 10-digit rodné číslo is simply valid whenever the entire 10-digit number divides evenly by 11. A documented exception covers numbers issued between 1954 and 1985, where the first nine digits leave a remainder of 10 when divided by 11 and the final digit is 0. Numbers issued before 1954 have only 9 digits, predate the check-digit system entirely, and are accepted on format alone. The number is conventionally written YYMMDD/SSSS, with the month offset by 50 for women.
How this validator works
This tool strips the slash and any whitespace, then checks length: 9 digits are accepted on format alone, while 10 digits must divide evenly by 11 (or satisfy the 1954-1985 exception). It runs entirely in your browser, with nothing transmitted or stored.
What a pass doesn’t tell you
A pass confirms the digits satisfy the divisibility rule — not that the number was ever issued by Slovakia’s population register (REGOB) or is currently active. Because Slovakia and Czechia have maintained separate records since 1993, a passing number has not been checked against either country’s actual register.
Scope: this page covers rodné číslo format and checksum validation only — not identity or registration lookups, and never the embedded date of birth or sex.
Content last reviewed 2026-08-09.
Rodné číslo FAQ
Is Slovakia's rodné číslo the same number as Czechia's?
The format and math are identical — both trace back to the number Czechoslovakia introduced in 1954 — but they're not the same registry. Since the 1993 split, Slovakia and Czechia have each issued and recorded their own rodné číslo independently, so a number valid in one country's records says nothing about the other's.
How is the check digit calculated?
There's no separate weighted check digit — a 10-digit rodné číslo is valid whenever the full 10-digit number divides evenly by 11, with a narrow 1954-1985 exception where the first nine digits leave a remainder of 10 and the final digit is 0. Numbers issued before 1954 have 9 digits and no check at all.
Does a valid rodné číslo confirm someone is registered in Slovakia?
No. It confirms the digits are arithmetically consistent, not that Slovakia's population register has that specific number on file for a real person.