When Luxembourg centralized their coverage records in 1970, everyone was assigned a “registration number”. Since then, a registration number is assigned when an individual starts working.

If someone files for Luxembourg benefits and doesn't have a registration number, Luxembourg assigns a number.

The Luxembourg registration number consists of 11 digits which are assigned as follows:

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  Digits 1-4 represent the year of birth;

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  Digits 5-6, month of birth;

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  Digits 7-8, day of birth; and

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  Digits 9-11 are a control number that is assigned to identify persons born on the same day.