以下为DUN-14英文介绍：
 

DUN is not really a barcode type. It’s a Distribution Unit Number. However, it is frequently constructed from 12/13 digit retail barcode numbers, and uses a special check digit.

DUN-14 numbers may be represented by ITF or EAN 128 barcode, and modern implementation should use EAN128.

DUN-14 in EAN128 barcode form may be created by providing 13 digits (the Logisitcal Variant digit – normally 0 in the UK) followed by the first 12 of the retail digits (eg. from EAN-13 numbers but without EAN's check digit). The DUN check digit is then calculated and the barcode symbol produced using EAN128 symbology.