The RID is part of an Application Identifier (AID), which is structured according to ISO/IEC 7816-5 and consists of two parts:
- The RID, unique to an application provider and assigned according to ISO/IEC 7816-5.
- An optional field assigned by the application provider known as a Proprietary Application Identifier Extension (PIX), used to identify different applications or products.
Registered application provider identifier (International RID, five bytes set to "AX")
Registration application provider identifier
Proprietary application identifier extension