Subset A      Subset C

Code 128 is the standard for most bar code labels, and is a very compact method for encoding numeric and alphanumeric strings. It has three modes: A, B & C, each encoding a different range of characters. Code C is numeric only and supports compressed encoding of 2 digits for every bar code symbol.
Ean 128 is typically used for palette labels and EDI related bar code labels.
UCC 128 is used for shipping containers, and is a 19 digit fixed length bar code.

So Datascan's Code 128 bar code is used to print EAN 128 and UCC 128 also.