Japan Corporate Number

Based >Extensible Algorithm Framework

The Japan Corporate Number algorithm is a built-in instance of the Checkdigit framework.

This algorithm masks input in the standard format of Japanese corporate numbers.

The characteristics of the input numbers are:

  • 13 digits long

  • the first digit is a checkdigit

  • checkdigit calculated using a MOD9 formula against the last 12 digits

  • no non-numeric characters

The algorithm instance will take an input of valid Japanese corporate numbers and return valid masked equivalent with new digits including a valid calculated checkdigit. The last 12 digits are masked, then a new checkdigit is derived from them and replaces the original one.

Input that does not meet the expected format will masked using a fallback instance of the CM Alpha-Numeric algorithm.

Examples:

Valid input:

  • “8479646972363“ → "4517383701384"

  • "6740537673905" → "2776072630930

     

Invalid Input

  • “111-222-333“ → “895-912-671“

  • "1234567890abcdefghij" → "1244102233iquxbsahjx"

  • null → null

  • ““ → ““