What is a Swiss AHV number?

The AHV (Alters- und Hinterlassenenversicherung), called AVS in French and Italian, is the Swiss social-security number. Since 2008 it has 13 digits beginning with 756 (the ISO 3166 numeric code for Switzerland), written 756.NNNN.NNNN.NC.

How is the AHV check digit calculated?

The final digit is an EAN-13 check digit over the first 12 digits: weight the digits alternately by 1 and 3, sum the weighted values, and the check digit is (10 − total mod 10) mod 10.

Why does it begin with 756?

756 is the ISO 3166-1 numeric country code for Switzerland. Every modern AHV number starts with it, so a number that does not begin 756 is invalid.

Does the AHV number contain personal data?

No. Since 2008 the AHV number is randomly assigned and encodes no birth date or gender, which is why this tool only verifies the prefix and the check digit.

Does a valid number mean it was really issued?

No. A passing result only means the prefix is correct and the check digit is consistent. It does not confirm the number exists in the central register — it is a format and check-digit validator only.

Is my AHV number uploaded anywhere?

No. The check runs entirely in your browser; the number you type is never uploaded.

Switzerland AHV Validator

The Swiss AHV number (AVS in French and Italian) is the country’s social-security identifier. Since 2008 it is 13 digits beginning with 756 and ending with an EAN-13 check digit. This validator confirms both the country prefix and the check digit so you can catch a mistyped number.

How it works

Because the modern AHV number is randomly assigned and carries no birth date or gender, only two parts are machine-checkable:

Prefix. The first three digits must be 756, the ISO numeric code for Switzerland.
EAN-13 check digit. Over the first 12 digits, each digit is weighted alternately by 1 and 3, the weighted values are summed, and the check digit is (10 − total mod 10) mod 10. It must equal the 13th digit.

Example

For 756.1234.5678.97, take the 12 leading digits 756123456789:

Weighting alternately by 1 and 3 and summing gives a total whose last digit determines the check.
The validator computes the expected 13th digit and compares it with the 7 you entered, reporting valid or showing the expected digit on mismatch.

Part	Example	Rule
Prefix	756	Must be Switzerland’s code
Body	1234.5678.9	First 12 digits overall
Check	C	EAN-13 over the 12

It runs entirely in your browser, so the number you type is never uploaded. A structurally valid AHV number is not guaranteed to be one that has actually been issued.