ISO 8583 DE Reference
Format: nLength: 3Fixed length
DE 23

Card Sequence Number

Data element
23
Format
n
Format defined in
ISO 8583:1987
Length
3
Encoding type
fixed
Bitmap
Primary

What it is

Distinguishes multiple cards sharing one PAN — on chip cards the Application PAN Sequence Number (EMV tag 5F34), e.g. primary and supplementary cards.

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
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