Your card number is on the front, usually in the center or lower half

The 16-digit number printed on the front of your card is your card number. It runs horizontally across the card face, often slightly raised so you can feel it. On some cards it appears in the middle; on others it sits in the lower half. The number is the unique identifier that tells the card network and your bank which account the card belongs to.

This is the number you enter when you shop online, over the phone, or through an app. It is also the number you give to a merchant if you are paying in person and the card reader is broken. You should memorize it or keep it written down somewhere safe — not in your wallet next to the card itself.

Key Takeaways

  • Your 16-digit card number appears on the front of the card in raised print, usually in the center or lower portion.
  • The first digit or first few digits identify which card network issued it (Visa, Mastercard, American Express, Discover).
  • The expiration date sits to the right of the card number and tells you when the card stops working.
  • The three-digit security code on the back is required for online purchases but should never be stored or shared unnecessarily.
  • Never photograph your full card or write down all four numbers together in one place.

The first digits tell you which card network issued your card

The opening digits of your card number identify the card network. Visa cards start with 4. Mastercard cards start with 5 or 2. American Express cards start with 3. Discover cards start with 6. This first digit is part of a larger system called the Issuer Identification Number (IIN), which tells merchants and payment processors who backs the card.

You do not need to memorize this, but it is useful to know if you are troubleshooting a payment problem. If a website says it does not accept your card type, the opening digit tells you whether the problem is real or a website error.

The expiration date is printed to the right of the card number

Your expiration date appears as two numbers separated by a slash — for example, 08/27. The first number is the month (08 = August) and the second is the year (27 = 2027). This date tells you when your card stops working. After that date, the card will be declined even if you have money in the account.

Banks typically mail you a replacement card 30 to 60 days before expiration. If you do not receive one, contact your bank. You can also request a replacement card online through your bank's app or website. The new card will have a new expiration date and usually a new card number, though some banks reissue with the same number.

The security code is on the back, and it is not the same as your PIN

On the back of your card, near the signature strip, you will find a three-digit security code. (American Express cards have a four-digit code on the front.) This code is called the CVV, CVC, or security code depending on which network issued your card. It is required when you shop online or by phone, but it should never be stored in your browser or written down.

This code is different from your PIN, which you use at ATMs and in-person at some stores. The security code is printed on the card itself and cannot be changed. Your PIN is a number you create and can change anytime through your bank's app or website.

What the other numbers on your card mean

Below the card number, usually on the left side, you will see your cardholder name — the name the card is registered under. This should match the name on your ID when you use the card in person. If your name changes, contact your bank to request a replacement card with the updated name.

Some cards also display a card issue number or valid from date, though these are less common on newer cards. These numbers were used more often in the past and are not required for most transactions today. If your card has them, they appear near the card number or below it.

How to protect your card number from theft

Your card number is the most sensitive piece of information on the card. If someone has it along with your expiration date and security code, they can make online purchases without your permission. Never photograph your full card or share a picture of it, even with people you trust.

When you shop online, only enter your card number on websites with a padlock icon in the address bar (this means the connection is encrypted). If you are paying over the phone, make sure you initiated the call — do not call a number from an email or text message claiming to be from your bank. Your bank will never ask you to provide your full card number or security code by email or text.

If your card is lost or stolen, contact your bank immediately. Most banks have a fraud line available 24/7, and the number is on the back of your card or in your account app. You are not responsible for fraudulent charges reported within 60 days, and many banks cover fraud even after that window.

Where to find your card number if you do not have the physical card

If you need your card number but do not have the card with you, log into your bank's app or website. Most banks display the full card number in your account dashboard, or at least the last four digits. Some apps show a digital version of your card that you can tap to reveal the full number.

If you cannot find it online, call the customer service number on the back of your card (or on a recent statement) and ask them to read it to you. They will verify your identity first. Never ask someone else to look up your card number for you, and never share your login credentials with anyone.

Frequently Asked Questions

Is it safe to write down my card number?

Writing down your full card number is riskier than keeping it in your head or in a password manager. If you must write it down, never include the expiration date and security code on the same piece of paper. Keep it in a locked drawer, not in your wallet or purse. Better yet, memorize it or store it in a password manager like Bitwarden or 1Password.

Why does my new card have a different number than my old one?

Most banks issue a new card number when your card expires or is replaced. This is a security measure — if your old card was compromised, the new number protects you from future fraud. Some banks reissue with the same number, but this is less common. Check your bank's app or call customer service to confirm your new number.

Can I use my card number without the physical card?

Yes. Your card number, expiration date, and security code are all you need to make an online or phone purchase. You do not need the physical card in your hand. This is why protecting these numbers is so important — someone with this information can shop without your permission.

What if I see charges I do not recognize?

Contact your bank's fraud line immediately. The number is on the back of your card or in your app. Report the charge and ask the bank to investigate. You are not responsible for fraudulent charges reported within 60 days. The bank will likely cancel your card and send a replacement with a new number.

Does the card number change if I change my PIN?

No. Your card number stays the same when you change your PIN. Your PIN is a separate security feature used only at ATMs and some in-person stores. Changing your PIN does not affect your card number or expiration date.