ISO 8583 DE Reference
Format: ansLength: 15Fixed length
DE 42

Card Acceptor Identification Code

Data element
42
Format
ans
Length
15
Encoding type
fixed
Bitmap
Primary

What it is

The merchant identifier (MID) assigned by the acquirer. Appears on statements and in dispute records.

Specification reference

Defined in ISO 8583:1987 (base). Card networks publish their own dialect tables (Visa BASE I / V.I.P., Mastercard CIS) that refine formats, lengths, and — for private-use elements — the entire layout. Always confirm against the interface specification you implement.

Decode & build this element

📦ISO 8583 Parser🗺️ISO 8583 Bitmap Decoder

Related data elements

DE 41Card Acceptor Terminal IdentificationDE 43Card Acceptor Name / LocationDE 18Merchant Type (MCC)
← PreviousDE 41 Card Acceptor Terminal IdentificationNext →DE 43 Card Acceptor Name / Location