Application identifiers

An application identifier (AI) defines the purpose of the data in the symbol and how it is to be used. It is commonly used in GS1 barcodes. The GS1 Application Identifier (AI) appears after the Function Code 1 (FNC1) in Code 128, Data Matrix or DataBar Expanded barcodes.

However, application identifiers are commonly used not just in GS1 barcodes, also they are commonly used in Will Turner FHM barcodes. An application identifier appears at the start of FHM barcode in Code 128, while for QR Codes, AI appears after less than sign (<). An AI consists of 3 hexadecimal digits.

Examples

 * 200 refers to the Elizabeth Swann Reference Code
 * 23C refers to the 3DS Friend Code
 * 23D refers to the Wii Address Code
 * 23E refers to the registration date
 * 235 refers to the ACNL Dream Address
 * 239 refers to the Nintendo Network ID