AID / RID Decoder
Paste an Application Identifier or RID and identify the card scheme, the registered application provider, and the proprietary extension that follows it.
How an AID is structured
An Application Identifier names the payment application selected on a chip card. It splits into two parts: the Registered Application Provider Identifier (RID), a 5-byte value assigned through ISO/IEC 7816-5 that identifies the scheme or provider, and an optional Proprietary Application Identifier Extension (PIX) that the provider uses to distinguish products such as credit, debit, or a regional variant.
- RID — first 5 bytes (10 hex). Example: A000000003 = Visa
- PIX — up to 11 bytes that follow, provider-defined. Example: 1010 = Visa credit/debit
- Category — the leading nibble of the RID indicates the registration category (A = international)
Frequently asked questions
What is an AID in EMV?
It identifies the payment application on a chip card: a 5-byte RID assigned by ISO followed by an optional proprietary extension chosen by the provider.
Why does one card have several AIDs?
A single card often carries multiple applications — for example a global credit AID and a regional or common-debit AID — and the terminal selects one during application selection.
Working on application selection?
We build and certify EMV kernels and Android payment apps across schemes. See custom development →