Format: zLength: ..37Variable (LLVAR — 2-digit length prefix)
DE 35
Track 2 Data
What it is
Track 2 carries PAN=expiry+service code+discretionary data in the ISO 7813 code set, with "=" (encoded D) as separator. Chip transactions send the Track 2 Equivalent Data from EMV tag 57 here; contactless magstripe-mode sends dynamic CVC3 data in the discretionary field.
Like DE 2 this is cardholder data under PCI DSS — mask it in logs. The service code inside it (3 digits) tells the terminal and issuer how the card may be used; decode it with the service-code tool.
Example values
4761739001010119=28122011143857589PAN = expiry 2812, service code 201, discretionary data.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.