Tool to understand and calculate the digits and information present on French identity cards (the 2 lines of 36 characters at the bottom of the card)
French ID Card - dCode
Tag(s) : Fun/Miscellaneous
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French ID Card
Card Code Generator (2 Lines)
Checksum Calculator
Tool to understand and calculate the digits and information present on French identity cards (the 2 lines of 36 characters at the bottom of the card)
Answers to Questions
What does the French ID card code means?
The French identity ID card contains 72 characters on 2 lines (36 characters each). The first line starts with the letters ID followed by the country code of France: FRA, explanations:
| Position | Meaning of content |
|---|---|
| 1-2 | ID |
| Always the 2 letters ID (for IDentity) | 3-5 |
| FRA | Always the 3 letters FRA, ISO3166 country code on 3 characters |
| 6-30 | DCODE‹FR‹‹‹‹‹‹br>‹‹‹‹‹‹‹‹‹‹‹‹ |
| Lastname on 25-character, formatted in uppercase without accent, with the character ‹ replacing any non-alphabetical character. | 31-33 |
| Department number on 3 digits (before 2017 the department was on 2 digits followed by the number of the sub-prefecture) | 34-36 |
| ID of the agent having registered the card |
Example: ID FRA DCODE ‹FR ‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹ 001 123
The second line begins with the date of issue of the card followed by additional information including checksum codes, explanations:
| Position | Meaning of content |
|---|---|
| 1-2 | Year (on 2 digits) of creation of the card |
| 3-4 | Month (on 2 digits) of creation of the card |
| 5-7 | 3-digit department number (same as characters 31-33 of line 1) |
| 8-12 | Numeric code assigned by the card management system (chronologically incremented code) |
| 13 | Control key of the preceding 1-12 characters |
| 14-27 | SITE‹‹‹‹‹‹‹‹‹‹ |
| first name on 14-character, formatted in uppercase without accent, with the character ‹replacing any non-alphabetic character and a double chevron ‹‹ for to separate the possible second and third given names. | 28-33 |
| Birth date in the format YYMMDD | 34 |
| Date of birth control key (characters 28-33) | 35 |
| Sex (M or F) | 36 |
| Control key of all previous characters (first line of 36 characters + second line of 35 characters) |
Example: 19 06 001 12345 6 SITE ‹‹‹‹‹‹‹‹‹‹ 090101 5 M 1
How to calculate checksums?
The checksum is a number (from 0 to 9) it is calculated by associating with each character a value: 0 for the character <, 1,2,3,4,5,6,7,8,9 for numbers and 10 for A, 11 for B, etc. up to 35 for Z.
For each character, multiply it by one factor (among 3), the first will be multiplied by 7, the second by 3, the third by 1, then again the fourth by 7, the fifth by 3, etc.
Sum all the numbers obtained, and record the units digit of the total.
This digit is the control/checksum key.
Example: Calculate the sum and the control key for DCODE1<, the sum is 91+36+24+91+42+1+0=285 and so the key is 5 :
| D | 13 | *7 | =91 | Σ=91 |
| C | 12 | *3 | =36 | Σ=127 |
| O | 24 | *1 | =24 | Σ=151 |
| D | 13 | *7 | =91 | Σ=242 |
| E | 14 | *3 | =42 | Σ=284 |
| 1 | 1 | *1 | =1 | Σ=285 |
| ‹ | 0 | *7 | =0 | Σ=285 |
Source code
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