42:

Name: Issuer Identification Number (IIN)

Source: Icc

Format: Numeric

Length: 6 - 6

Description: The number that identifies the major industry and the card issuer and that forms the first part of the Primary Account Number (PAN)

4F:

Name: Application Identifier (AID)

Source: Icc

Format: Binary

Length: 5 - 16

Description: Identifies the application

50:

Name: Application Label

Source: Icc

Format: Text

Length: 1 - 16

Description: Mnemonic associated with the AID

56:

Name: Track 1 Data

Source: Icc

Format: Text

Length: 0 - 76

Description: Track 1 Data contains the data objects of the track 1, excluding start sentinel, end sentinel and LRC.

57:

Name: Track 2 Equivalent Data

Source: Icc

Format: Binary

Length: 0 - 19

Description: Contains the data elements of track 2