Join our WhatsApp channel for real-time updates on credit card offersJoin
Travel on Points

What is BIN?

ArvindTravel on Points

A Bank Identification Number (BIN) is the set of digits at the start of your credit or debit card number. It tells the payment system which institution issued the card. The same digits are also called an Issuer Identification Number (IIN)—BIN is the everyday name; IIN is the formal one.

In India you’ll hear BIN most often when an Amazon, Flipkart, jewellery, or airline offer “only works on certain BINs.” That is the shopper-side use of the same idea banks and networks already use to route every card payment.

Infographic of an orange credit card showing a 16-digit number broken into a 6-digit BIN, the newer 8-digit BIN, the account identifier, and the final check digit
A card number starts with the BIN (6 digits historically, often 8 digits now), then your account digits, then a check digit. Sample number for illustration only.

How a BIN fits inside the full card number

Your full card number (sometimes called the primary account number) is usually 15 or 16 digits, and can be longer. The opening digits are the BIN/IIN. Older cards commonly used 6-digit BINs; newer ranges often use 8 digits as more cards were issued worldwide. Digits after the BIN identify your account. The last digit is a check digit used to catch typing errors—it is not a secret like CVV.

  • First digit (major industry identifier): a clue about the card’s industry/network family (for example, many Visa cards start with 4).
  • Rest of the BIN/IIN: identifies the issuing bank or institution and product range.
  • Middle digits: your individual account on that product.
  • Last digit: check digit for number validation—not a password or CVV.

Why BINs exist

Before a payment can be approved, the network needs to know which issuer should authorise it. The BIN points the transaction to the right bank or card programme. That routing step is why two Visa cards from different banks can behave differently—and why fraud teams look at BIN details such as issuer and country when a charge looks unusual.

Example starting digits (for learning only)

These patterns are a rough guide only. Different banks issuing the same network (for example Visa) use different BIN ranges. Always confirm the card product in your bank app, and confirm offer eligibility in the offer rules.

NetworkOften starts withMasked exampleWhy it matters for offers
Visa4…4XXX XX•• •••• XXXXVisa-only bank offers can apply
Mastercard51–55 or 2221–27205XXX XX•• •••• XXXXMastercard-only bank offers can apply
American Express34 or 3737XX XXXXXX XXXXXAmex-only campaigns and Amex acceptance
RuPayOften 6… (varies)6XXX XX•• •••• XXXXRuPay / UPI credit offers and RuPay bank deals
Diners Club (via partners)Depends on the bank productCheck your bank appPartner portals and co-brand offers

How shopping apps use BIN for offers

How apps use BIN to decide if an offer appliesFlow showing a shopper paying on an app, the merchant reading the card BIN, checking a whitelist, then approving or denying the instant discount.Why one HDFC card can get an offer and another cannot1. YOU PAYAmazon / Flipkartjewellery / airlinecheckout2. READ BINFirst 6-8 digitsNetwork + issuerproduct range3. CHECK LISTAllowed cardsHDFC Visa MillenniaBINs only4. RESULTDiscountor declineTwo cards from one bank can have different starting digits - only allowed cards get the discount.
Bank offers usually allow only specific BIN ranges. Same bank, different card product → different BIN → the discount may fail.
  1. You pick a bank offer at checkout (Amazon, Flipkart, Myntra, jewellery weekend, airline promo, and similar).
  2. The payment page reads the first digits of the card you use.
  3. Those digits are checked against the offer’s allowed list (sometimes also the network and product name).
  4. If your BIN is allowed, the discount applies. If not, you may see “offer not applicable”—even when the card is from the “right” bank.
What you seeLikely causeWhat to do
“HDFC Visa” offer fails on your HDFC cardYour card product is not on the offer’s allowed listMatch the exact product name in the offer rules to the name in your bank app
Jewellery or gold weekend discount failsOnly listed bank + network cards are allowedConfirm the eligible card list before you book a slot
Flight or hotel bank promo fails at paymentYour card’s starting digits are not allowed for that promoKeep a second eligible card ready
Two people at the same bank get different resultsThey hold different products, so different BINsCompare product names—not only the bank logo

Stay safe when talking about BINs

  • Remember: offers often depend on BIN and on the network logo (Visa, Mastercard, RuPay, Amex).
  • If an offer fails, tell support the card product name and the error message—not your full card number.
  • If a store asks for the “first 6 digits” for an offline discount, share only those digits.
  • Never paste a full card number, CVV, or OTP into random “BIN checker” sites or chat groups.
TermWhat it tells youWhy shoppers care
BIN / IINWhich bank or issuer issued the cardWhy offer A works on one card but not another
MCCHow the merchant is categorised (dining, fuel, rent…)Why rewards or cashback apply—or get blocked
MDRWhat the merchant pays to accept cardsWhy some shops prefer UPI or add a surcharge
Network logoVisa / Mastercard / RuPay / AmexWhere the card works and which bank offers can show up