ISO/IEC 7813

ISO/IEC 7813 is an international standard codified by the International Organization for Standardization and International Electrotechnical Commission that defines properties of financial transaction cards, such as ATM or credit cards.[1]

Scope

The standard defines:

  • physical characteristics, such as size, shape, location of magnetic stripe, etc.
  • magnetic track data structures

Physical characteristics

ISO/IEC 7813 specifies the following physical characteristics of the card, mostly by reference to other standards:

Embossed characters
by reference to ISO/IEC 7811
Embossing of expiration date
the format (MM/YY or MM-YY)
Magnetic stripe
by reference to ISO/IEC 7811
Integrated circuit with contacts
by reference to ISO/IEC 7816-1
Integrated circuit without contacts
by reference to ISO/IEC 10536-1, ISO/IEC 14443-1, and ISO/IEC 15693-1

Magnetic tracks

Track 1

The Track 1 structure is specified as:

  • STX : Start sentinel "%"
  • FC : Format code "B" (The format described here. Format "A" is reserved for proprietary use.)
  • PAN : Payment card number 4400664987366029, up to 19 digits
  • FS : Separator "^"
  • NM : Name, 2 to 26 characters (including separators, where appropriate, between surname, first name etc.)
  • FS : Separator "^"
  • ED : Expiration data, 4 digits or "^"
  • SC : Service code, 3 digits or "^"
  • DD : Discretionary data, balance of characters
  • ETX : End sentinel "?"
  • LRC : Longitudinal redundancy check, calculated according to ISO/IEC 7811-2

The maximum record length is 79 alphanumeric characters.

Examples

%B4815881002861896^YATES/EUGENE JOHN         ^37829821000123456789?

%B4815881002861896^YATES/EUGENE L            ^^^356858      00998000000?

Track 2

The Track 2 structure is specified as:

  • STX : Start sentinel ";"
  • PAN : Primary Account Number, up to 19 digits, as defined in ISO/IEC 7812-1
  • FS : Separator "="
  • ED : Expiration date, YYMM or "=" if not present
  • SC : Service code, 3 digits or "=" if not present
  • DD : Discretionary data, balance of available digits
  • ETX : End sentinel "?"
  • LRC : Longitudinal redundancy check, calculated according to ISO/IEC 7811-2

The maximum record length is 40 numeric digits (e.g., 5095700000000).

Track 3

Track 3 is virtually unused by the major worldwide networks and often isn't even physically present on the card by virtue of a narrower magnetic stripe.

A notable exception to this is Germany, where Track 3 content was used nationally as the primary source of authorization and clearing information for debit card processing prior to the adoption of the "SECCOS" ICC standards. Track 3 is standardized nationally to contain both the cardholder's bank account number and branch sort code (BLZ).

Programming

Parsing Track 1 and Track 2 can be done with Regular Expressions.

Track 1

^%B([0-9]{1,19})\^([^\^]{2,26})\^([0-9]{4}|\^)([0-9]{3}|\^)([^\?]+)\?$

This Regex will capture all of the important fields into the following groups:

  • Group 1: Payment card number (PAN)
  • Group 2: Name (NM)
  • Group 3: Expiration Date (ED)
  • Group 4: Service Code (SC)
  • Group 5: Discretionary data (DD)

Track 2

^\;([0-9]{1,19})\=([0-9]{4}|\=)([0-9]{3}|\=)([^\?]+)\?$

  • Group 1: Primary Account Number (PAN)
  • Group 2: Expiration date (ED)
  • Group 3: Service code (SC)
  • Group 4: Discretionary data (DD)
gollark: Arguably more <#426054105577029654>. But you could use it as an SMS gateway, or a security camera, or something.
gollark: He's on here pretty regularly.
gollark: I don't know. I'd assume it's fairly short.
gollark: Can't say about the first one, but I think there are cheap 433 MHz transceiver things for raspberry pis available. They can do WiFi and Bluetooth themselves, so you could maybe just use that.
gollark: Maybe it changes the settings on one of the video outputs in some odd way.

References
  1. ISO/IEC 7813:2006 Information technology -- Identification cards -- Financial transaction cards

Reference implementations
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