# stdnum.at.vnr

VNR, SVNR, VSNR (Versicherungsnummer, Austrian social security number).

The Austian Versicherungsnummer is a personal identification number used for social security. The number is 10 digits long and consists of a 3 digit serial, a check digit and 6 digits that usually specify the person’s birth date.

More information:

- https://de.wikipedia.org/wiki/Sozialversicherungsnummer#Österreich

    >>> validate('1237 010180')
    '1237010180'
    >>> validate('2237 010180')
    Traceback (most recent call last):
        ...
    InvalidChecksum: ...

stdnum.at.vnr.calc_check_digit(number)

  Calculate the check digit. The fourth digit in the number is ignored.

stdnum.at.vnr.compact(number)

  Convert the number to the minimal representation. This strips the number of any valid separators and removes surrounding whitespace.

stdnum.at.vnr.is_valid(number)

  Check if the number is a valid VAT number.

stdnum.at.vnr.validate(number)

  Check if the number is a valid VAT number. This checks the length, formatting and check digit.