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Barcodes in the GS1 system (like GS1-128) use Application Identifiers (AIs) to provide information about the structure of the encoded data. An Application Identifier (AI) is a prefix consisting of 2 to 4 characters that identifies the meaning and format of the following data. Below you will find a list of the most commonly used application identifiers.
An element string is the combination of a GS1 Application Identifier and a GS1 AI data field. The data following an AI can be alphanumeric or numeric and with fixed or variable data lengths. The symbology character FNC1 is used as field separator.
For more information (e.g. a list of all available AIs), please follow the links below:
GS1 Application Identifier browser GS1 General Specifications
Data string of a barcode containing four different data fields
019901234567001931020012251519052110Ab1234
This Barcode Studio training video demonstrates how to create an GS1-128 / EAN-128 barcode with two Application Identifiers delimited by FNC1.
GS1-DataBar / GS1-Databar Composite Symbology™
GS1-DataBar Stacked / GS1-DataBar Stacked Omnidirectional
GS1 DataMatrix | GS1 QR Code®
For a complete list of available GS1 Application Identifiers, see the links below: