ISNI Check Digit Calculator

How ISNI Check Digit Calculator Works?

The ISNI Check Digit Calculator works by running the first 15 digits of an International Standard Name Identifier (ISNI) through ISO 7064 MOD 11-2 and writing the result as the 16th character. The check character is a digit or X.

1. 1Enter the 15-digit ISNI payload, ignoring spaces.
2. 2Set a running total to 0.
3. 3For each digit, add it to the total, double the result, and keep the remainder after division by 11.
4. 4Compute (12 − total) mod 11.
5. 5Write 10 as X and format the ISNI in 4 blocks of 4 characters.

ISNI Check Digit Calculator Formula

The ISNI formula is c = (12 − p₁₅) mod 11, where p is the ISO 7064 MOD 11-2 running value.

pᵢ = ((pᵢ₋₁ + dᵢ) × 2) mod 11,  p₀ = 0
c = (12 − p₁₅) mod 11,  10 → X

• dᵢ is the i-th ISNI digit.

Running total after 15 digits = 2
Check value = (12 − 2) mod 11 = 10
ISNI = 0000 0001 2146 438X

ISNI Check Digit Calculator Conversion Table

The ISNI conversion table lists sample ISNI payloads with their check character.

What is ISNI Check Digit Calculator?

An ISNI Check Digit Calculator is a tool that computes the 16th character of an International Standard Name Identifier (ISO 27729). An ISNI identifies the public identity of a person or organisation involved in creative works.

Authors, performers, publishers, and record labels receive ISNIs through registration agencies. ORCID iDs are drawn from a reserved block of the ISNI number space.

What are the uses of ISNI Check Digit Calculator?

There are 3 main uses of the ISNI Check Digit Calculator, including author disambiguation, rights management, and metadata checks.

• Author disambiguation: Libraries tell apart creators with the same name.
• Rights management: Collecting societies link royalties to the right party.
• Metadata checks: Publishers validate ISNIs in ONIX and DDEX feeds.