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