Rodne Cislo is the unique number, the
"Birth Number", assigned to every single person living in Czech Republic.
This number consist of 10 digits in which first 6 digits are derived from date of bith and the sex of the person.
The remaining 4 digts are the random digits which give uniqueness to the birth number and it can be and can be anywhere between 0000 and 9999.
This number considered valid if it is divisible by 11 with no remainder.
People born before the year 1954 has birth number in same format but contains only 9 numbers and it is not divisible by 11.