online lookups

Card Payment Code Lookups and Calculators

The tables you look up most while debugging a message, plus the bitmap you have to compute. Like the parser, everything runs in your browser — nothing you type is uploaded.

Lookup tables

Type a code or a keyword, get the meaning

DE39 Response Code Lookup

Look up any ISO 8583 DE39 response code: 00 approved, 05 do not honor, 51 insufficient funds, 54…

FreeDE39

EMV TLV Tag Lookup

Look up EMV TLV tags found in DE55: 9F26 application cryptogram (ARQC), 95 TVR, 82 AIP, 9F34 CVM…

FreeEMV

EMV AID Lookup

Search any EMV Application Identifier and see which card scheme and product it belongs to. Cover…

FreeAID

Currency Codes and Exponents

Look up ISO 4217 numeric codes (used in DE49) and decimal exponents: JPY 392 with zero decimals,…

Free4217

MCC Lookup

Look up common merchant category codes: 5411 grocery, 5812 restaurants, 5541 service stations, 6…

FreeMCC

Field decoders

Paste one value from a message and see every part explained

MTI Decoder

Enter a four-digit MTI and see it broken down: version, message class, function and origin, each…

FreeMTI

TVR Decoder (Tag 95)

Paste a 10-hex-digit TVR (EMV tag 95) and see every bit decoded byte by byte — plus a searchable…

FreeTVR

DE3 Processing Code Decoder

Enter a six-digit DE3 and see all three parts explained: transaction type, from-account and to-a…

FreeDE3

DE22 POS Entry Mode Decoder

Enter a three-digit DE22 and see both parts explained: how the PAN was captured (magstripe, chip…

FreeDE22

Calculators

The ones that compute rather than look up

ISO 8583 Bitmap Calculator

Calculate an ISO 8583 bitmap online: turn a list of data element numbers into a hex bitmap, or p…

FreeBITMAP