--- title: "Mastercard 2-Series BINs" date: 2026-10-15 author: "Zak Matthews" featured_image: "https://chargebacks911.com/wp-content/uploads/2026/10/Mastercard-BIN-Series-2-blog.jpg" categories: - name: "Banking" url: "/banking.md" tags: - name: "mastercard" url: "/tag/mastercard.md" - name: "technology" url: "/tag/technology.md" --- # Mastercard 2-Series BINs ## Everything You Need to Know About Mastercard 2-Series Cards For most of Mastercard’s history, a Mastercard card number always began with “5.” Every checkout form, terminal, and fraud rule written before 2017 could rely on that. And a great many of them did. That rule stopped holding in 2017, when Mastercard began issuing cards with card numbers that began with 2. There are now a lot of those Mastercard 2-series card in circulation. In this post, we will set out the official 2-series range, what the acceptance fines were and who was actually charged, where these cards still fail, and how to test that your own checkout accepts them. ### Recommended reading - [Shortened Descriptors: How to Optimize Your Static Prefix](https://chargebacks911.com/shortened-descriptor/) - [Chargeback Stats: All the Key Dispute Data Points for 2026](https://chargebacks911.com/chargeback-stats/) - [Order Fulfillment: Strategy, 2026 Checklist & Best Practices](https://chargebacks911.com/online-order-fulfillment-process/) - [Mastercard Chargeback Prevention Best Practices for 2026](https://chargebacks911.com/prevent-chargebacks/prevent-mastercard-disputes/mastercard-chargeback-prevention-best-practices/) - [Stop Chargebacks With Mastercard First-Party Trust Program](https://chargebacks911.com/prevent-chargebacks/prevent-mastercard-disputes/mastercard-first-party-trust-program/) - [Best Chargeback Management Software for 2026](https://chargebacks911.com/best-chargeback-management-software/) ## What Is the Mastercard 2-Series BIN Range? TL;DRThe Mastercard 2-series BIN range is 222100 to 272099. A [bank identification number](https://chargebacks911.com/bank-identification-numbers/) (BIN) is the first eight digits of a card number. BIN numbers used to be six digits in length before card networks adopted the extended ISO/IEC 7812-1 numbering standard in April 2022. The first digit of the BIN on its own is the major industry identifier. 4 and 5 were traditionally reserved for banking and finance, while 2 was originally assigned to airlines. However, that class saw comparatively little use; so little, in fact, that Mastercard was allowed to repurpose a range of numbers within it. The Mastercard 2-series BIN range is 222100 to 272099. Every card number issued with a number in that range is Mastercard-branded. It was authorized, cleared, and disputed under the same Mastercard rules as a card beginning 51 to 55. Which digits a checkout has to read on a Mastercard number Two Mastercard numbers. 5555 5555 5555 4444 begins 55, in the 51 to 55 range. 2223 0031 2200 3222 begins 2223, in the 2221 to 2720 range added in 2017. Both are valid Mastercards. A checkout that only checks for the first range turns away the second. 5555 5555 5555 4444 MastercardMastercard numbers begin 51 to 55. 2223 0031 2200 3222 MastercardSince 2017, Mastercard numbers also begin 2221 to 2720. A checkout that only checks for the top row *turns away* the bottom row. In practice this means 2-series acceptance has been a condition of accepting Mastercard for almost a decade. Not all systems are equipped to handle 2-series BIN cards, however, because numbers starting with 2 were not historically widely used, and a system nobody has updated will not have updated itself. ## Where Can 2-Series Cards Still Fail? Nearly a decade later, most terminals can accept 2-series cards with no problem. But, there’s still the potential for errors. Online sellers have multiple points of vulnerability, including: - Web Apps - Shopping Cart & Checkout Software - Payment Gateways - Proprietary Systems - Internal or External Loyalty Programs - Data Analytics - [Fraud Prevention](https://chargebacks911.com/bin-attack/) [Check with your acquirer](https://chargebacks911.com/the-acquiring-bank/) to ensure you’re covered, then contact your vendor for any of the above services that apply. Ensure that they can accept and process Mastercard 2-series cards, or whether they will require a plugin to do so. Mastercard’s checklist also names dispute resolution systems, data warehouses, and staff training as areas to verify. The most common point of failure in an eCommerce stack is also the simplest one: a card-number check on the checkout form — or in the [payment gateway](https://chargebacks911.com/payment-gateway/) plugin behind it — that is still set to recognize only Mastercard numbers beginning in the 51 to 55 range. The card never reaches the acquirer, so no decline code is returned, and no report records the lost sale. Common QuestionWhat do I do if I need to update my terminal to accept Mastercard 2-series cards?Few businesses can afford to replace their stock of payment terminals every few years. As a result, many rely on older terminals. If you use a payment terminal, it may have required a software update to process 2-series cards. The machine may even require outright replacement depending on its age and make. If your payment terminal is provided by your acquirer, they can tell you whether you still require an update or a replacement. [ ![Chargebacks for Dummies](https://chargebacks911.com/wp-content/themes/CB911/assets/img/shortcodes/ebooks/book--dummies.png) Everything You Need To Know A Beginner’s Guide to ChargebacksChargebacks can wreak havoc on your cash flow and profitability. This FREE paperback book is your guide for preventing chargebacks and, when they happen, fighting them more effectively. Send Me My Free Paperback Book!](https://ad.chargebacks911.com/chargebacks-for-dummies) ## How to Verify Your Checkout Accepts 2-Series Cards The verification process is short, and it can be handed to a developer or run by whoever owns checkout. It has four parts; the order of operations matters, though, because the first part cannot catch a failure in the second. Testing 2-series acceptance ### Only the Live Test *Covers the Whole Path.* A card number passes through several systems on its way to your acquirer. Each of the four tests looks at a different part of that path. The path a card number takes 22231. Checkout form Card-number field 2. Gateway plugin Behind the form 3. BIN rules Fraud, loyalty, reporting 4. Processor Sandbox or live 5. Acquirer Your merchant bank What each test checks - Checked - Not checked 1. 1Run a Test PaymentIn the processor’s sandbox Checks the processor only. 2. 2Validate the Card Number on the Checkout FormBefore the number is sent anywhere Checks the checkout form and gateway plugin. 3. 3Review Every Rule That Reads the BINFraud rules, BIN tables, loyalty and reporting Checks the BIN rules. 4. 4Run a Live 2-Series TransactionThe real test, end to end Checks the whole path, from the checkout form to the acquirer. Simplified path. Systems that read the BIN, such as fraud rules, loyalty programs and reporting, are grouped as one stop. ![Run a Test Payment](https://chargebacks911.com/wp-content/uploads/2021/10/NEW-ICONS-DuoTone-Lineal-Icons_DuoTone-Iconz_DuoTone-Iconz-01.svg) ### Step #1 | Run a Test Payment Run a test payment with a 2-series number in the processor’s sandbox. Processors publish these in their own documentation: Stripe lists 2223003122003222 as its Mastercard 2-series test card, and Adyen publishes several beginning 2222 and 2223. The number must come from your own processor, because a test card is valid only on the platform that issued it. ![Validate the Card Number on the Checkout Form](https://chargebacks911.com/wp-content/uploads/2021/07/NEW-ICONS-DuoTone-card-emv-hand-giving.svg) ### Step #2 | Validate the Card Number on the Checkout Form Look at the card-number validation on the checkout form itself. Where the form, or the gateway plugin behind it, checks the leading digits before the number is sent anywhere, the accepted Mastercard range must include 2221 to 2720 as well as 51 to 55. A form that fails here rejects the card before the processor ever sees it. ![Review Every Rule That Reads the BIN](https://chargebacks911.com/wp-content/uploads/2021/04/NEW-ICONS-DuoTone-more-receipts.svg) ### Step #3 | Review Every Rule That Reads the BIN Fraud rules, BIN lookup tables, loyalty programs, and reporting that classifies cards by their first digit all need to file a 2-series number under Mastercard. If we’re talking about fraud rules, “unknown” usually means “declined.” ![Run a Live 2-Series Transaction](https://chargebacks911.com/wp-content/uploads/2022/06/NEW-ICONS-DuoTone-Lineal-Icons-ChipandPin_DuoTone-Iconz-153.svg) ### Step #4 | Run a Live 2-Series Transaction This is the real test, and the cure Mastercard’s field testing required in 2017. Running a live transaction remains the only evidence that settles the question with an acquirer once and for all. Important!A card-present terminal is tested the same way, with a physical test card from the acquirer or the terminal vendor, rather than a number typed into a form. ## What Happens if a Transaction Fails Due to Inability to Accept 2-Series Cards? TL;DRIf a transaction fails because you can’t accept 2-series cards, it just registers as another declined sale on a valid card. In practical terms, this means the cardholder sees “invalid card number,” and then leaves to go spend their money elsewhere. When Mastercard began field testing merchant acceptance on June 30, 2017, any location that could not process a 2-series card exposed its acquirer to a noncompliance assessment. A location that was identified as being unable to accept a 2-series card received a cure period. They could avoid an assessment by successfully processing one 2-series transaction from that location. If they didn’t cure the problem, then an assessment was levied on the acquirer, who could then pass it to the merchant (if allowed under the merchant agreement). These penalties increased based on the number of days passed after deadline: Days Passed from July 1, 2017PenaltyLess than 30 Days**$2,500**31-60 Days**$5,000**61-90 Days**$10,000**91 or More Days**$20,000** As of 2026, though, the field testing program is long finished. Now, the consequence of rejecting a 2-series card is commercial rather than regulatory: it just registers as another declined sale on a valid card. Neither Mastercard, nor the acquirer, will report the reason for the decline to you. In practical terms, this means the cardholder sees “invalid card number,” and then leaves to go spend their money elsewhere. Mastercard will not assess you for it, and your acquirer will not report it. The sale is simply lost because of a rule that was implemented a decade ago. ## FAQs ### Is a card number starting with 2 a real Mastercard? Yes, if it falls between 2221 and 2720. Mastercard has issued cards in the 222100 to 272099 range since 2017, alongside the 51 to 55 range. A number starting with 2 that sits outside that range is not a Mastercard. ### Do 2-series Mastercard cards cost more to accept? No. Mastercard’s interchange rates are set by card product, merchant category, and how the transaction is presented, and the account range is not a factor. A commercial or premium card in the 2-series costs what the same product costs in the 5-series. ### Are Mastercard 2-series fines still charged? The field testing program that produced the 2017 assessments is not an ongoing program. Mastercard’s rules on card acceptance have not changed, and an acquirer may still assess a merchant it finds unable to accept a valid Mastercard, but in practice the exposure today is the declined sale rather than the fine. If your acquirer has flagged you, confirm its position in writing.