# FNR The FNR generator transforms Norwegian national identity numbers. In Norwegian, the term for national identity number abbreviates to FNR. The first six digits of an FNR reflects the person's birthdate. You can choose to preserve the birthdates from the source values in the destination values. If you do not preserve the source values, the destination values are still within the same date range as the source values. Another digit in an FNR indicates whether the person is male or female. You can specify whether to preserve in the generated value the gender indicated in the source value. The last digits in an FNR are a checksum value. The last digits in the destination value are not a checksum - the values are random. ## Characteristics


Consistency	Yes, can be made self-consistent or consistent with another column.
Linking	No, cannot be linked
Differential privacy	No
Data-free	No
Allowed for primary keys	No
Allowed for unique columns	Yes
Uses format-preserving encryption (FPE)	No
Privacy ranking	3 if not consistent 4 if consistent
Generator ID (for the API)	`FnrGenerator`

## How to configure To configure the generator: 1. To preserve the gender from the source value in the destination value, toggle **Preserve Gender** to the on position. 2. To preserve the birthdate from the source value in the destination value, toggle **Preserve Birthdate** to the on position. 3. Toggle the **Consistency** setting to indicate whether to make the generator consistent.\ \ By default, consistency is disabled. 4. If you enable consistency, then by default the generator is self-consistent.\ \ To make the generator consistent with another column, from the **Consistent to** dropdown list, select the column.\ \ When a generator is self-consistent, then a given value in the source database is always mapped to the same value in the destination database.\ \ When a generator is consistent with another column, then a given value for that other column in the source database results in the same value in the destination database. For example, if the FNR column is consistent with a Name column, then every instance of John Smith in the source database results in the same FNR in the destination database. 5. If [Structural data encryption](/app/generation/generators-assign-config/generators-data-encryption-config.md) is enabled, then to use it for this column, in the advanced options section, toggle **Use data encryption process** to the on position. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.tonic.ai/app/generation/generators/generator-reference/fnr.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.