Swiss OASI Number

All ETH students need an OASI number (Swiss Old Age and Survivors’ Pension Insurance or “AHV” in German) by the time they enrol for the second semester of studies at the latest. The exceptions are:

  • special students
  • auditors
  • exchange students
  • teaching certificate students

How to obtain a OASI / AHV number

If no AHV number has been supplied, the necessary information (country of birth, birthplace, parents' first and last name) can be filled in in myStudies. This information is used to obtain the AHV number.

After clicking on the buttonSave the information will be saved and myStudies will return to the Welcome page.

Further information

Further information about the AHV can be found on the Student portal.

Structure of the OASI / AHV number

The Swiss OASI number originally a social security / national insurance number, is widely used as a personal identification number (PIN) by all federal registers such as education and social security. The PIN consists of an initial 3-digit country code, a nine-digit random number which provides a lifelong, anonymous identification unique to each person, and a final check digit. The family name is not encoded in the number. The resulting 13-digit number is structured as follows:

  • Positions 1 to 3: Country code (Switzerland = 756)
  • Position 4: period
  • Positions 5 to 8: 4-digit number
  • Position 9: period
  • Positions 10 to 13: 4-digit number
  • Position 14: period
  • Positions 15 to 16: 2-digit number

The check digit in position 16 is calculated according to EAN-13 regulations.

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