What are Mastercard's BIN prefix ranges?

Mastercard uses two BIN ranges: 51–55 (classic, introduced decades ago) and 2221–2720 (2-series, introduced in 2017 to provide more capacity). Both are 16-digit cards. Some payment forms and libraries only accept 51–55 as Mastercard — testing with 2-series numbers helps catch this validation bug.

What is 5555 5555 5555 4444?

5555 5555 5555 4444 is Stripe's primary Mastercard test card that always returns a successful authorization in Stripe's sandbox. It's a classic BIN range Mastercard (starts with 55).

Should I test with both BIN ranges?

Yes. Some older payment form validators only accept the 51–55 range as Mastercard and will incorrectly reject 2-series cards (22xx–27xx). Testing both ranges helps ensure your validation is current.

Mastercard Test Card Numbers — Generator

Generate Luhn-valid Mastercard test numbers using both legacy (51–55) and 2-series (2221–2720) BIN ranges.

Last updated: April 2026

Card Network

Quantity (1–100)

Expiry dateCVVCardholder nameSpaced format

These are test numbers only. They will not process any real transaction. Use only in sandbox / test mode with test API credentials.

What it does

Both Mastercard BIN ranges

Generates from both the classic 51–55 BIN range and the newer 2221–2720 (2-series) range.

16-digit length

Standard Mastercard length is 16 digits.

3-digit CVV

Mastercard uses a 3-digit CVC2 on the signature strip.

Luhn-valid

Every generated number passes the Luhn mod-10 checksum algorithm.

How to use Mastercard Test Card Numbers — Generator

1
Select Mastercard
Click the Mastercard button in the network selector.
2
Generate
Click Generate Cards to produce Luhn-valid 16-digit Mastercard numbers.
3
Use in your payment form
These numbers work for format validation testing. For scenario testing, use the Stripe or Braintree provider-specific Mastercard numbers.

The 2-series Mastercard BIN range

In 2017, Mastercard introduced the 2221–2720 BIN range (sometimes called the "2-series") to provide additional capacity as the 51–55 range approached exhaustion. Cards starting with 22, 23, 24, 25, 26, or 27 (within the 2221–2720 range) are valid Mastercard numbers and should be accepted by any modern payment implementation. Testing with a 2-series card number catches outdated BIN validation that only accepts 51–55.

Frequently Asked Questions

What are Mastercard's BIN prefix ranges?: Mastercard uses two BIN ranges: 51–55 (classic, introduced decades ago) and 2221–2720 (2-series, introduced in 2017 to provide more capacity). Both are 16-digit cards. Some payment forms and libraries only accept 51–55 as Mastercard — testing with 2-series numbers helps catch this validation bug.
What is 5555 5555 5555 4444?: 5555 5555 5555 4444 is Stripe's primary Mastercard test card that always returns a successful authorization in Stripe's sandbox. It's a classic BIN range Mastercard (starts with 55).
Should I test with both BIN ranges?: Yes. Some older payment form validators only accept the 51–55 range as Mastercard and will incorrectly reject 2-series cards (22xx–27xx). Testing both ranges helps ensure your validation is current.