The Application Identifier (AID) is a value that indicates the program / routine used to process EMV Transaction Data. Both the Terminal and the Card have a list of AIDs that they have have been programmed to use in transaction processing.
A fully-qualified AID contains both an RID and a PIX. The RID, or Registered Application Provider ID, is the 1st 10 Bytes of the AID, and it designates the Payment Scheme (as defined by ISO 7816-4) used for the transaction. PIX is the "Proprietary Application Identifier Extension, and it is the part of the AID after the first 10 characters."
Tag 4F stores the AID for the card, and Tag 9F06 stores the AID for the Terminal. Tag 84 provides the "Dedicated File Name," which is typically the AID.
The Applications that both the Card and the Terminal have in common is called a "Candidate List." If there are no matching AIDs for both the Card and the Terminal, the "Candidate List" is considered "empty," resulting in a Fallback to Mag Swipe, which means that the transaction will not be processed as an EMV transaction.
Following is a list of some of the most common AIDs:
| Brand / Card Scheme |
Product |
RID |
PIX |
AID |
| American Express | Amex | A000000025 | 01 | A00000002501 |
| Discover | Diners / Discover | A000000152 | 3010 | A0000001523010 |
| Discover | US Common Debit AID | A000000152 | 4010 | A0000001524010 |
| Discover | ZIP | A000000324 | 1010 | A0000003241010 |
| MasterCard | Credit or Debit | A000000004 | 1010 | A0000000041010 |
| MasterCard | U.S. Maestro | A000000004 | 2203 | A0000000042203 |
| MasterCard | Maestro | A000000004 | 3060 | A0000000043060 |
| MasterCard | Cirrus | A000000004 | 6000 | A0000000046000 |
| MasterCard | MasterCard | A000000004 | 9999 | A0000000049999 |
| Visa | Credit or Debit | A000000003 | 1010 | A0000000031010 |
| Visa | Electron | A000000003 | 2010 | A0000000032010 |
| Visa | V-Pay | A000000003 | 2020 | A0000000032020 |
| Visa | Interlink | A000000003 | 3010 | A0000000033010 |
| Visa | Plus | A000000003 | 8010 | A0000000038010 |
| Visa | Visa Common Debit | A000000098 | 0840 | A0000000980840 |
| JCB | Japan Credit Bureau | A000000065 | 1010 | A0000000651010 |
| UnionPay | Debit (China) | A000000333 | 010101 | A000000333010101 |
| UnionPay | Credit (China) | A000000333 | 010102 | A000000333010102 |
| UnionPay | US UP Common Debit | A000000333 | 010108 | A000000333010108 |
| Interac | Canada Debit | A000000277 | 1010 | A0000002771010 |
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