Where to find your computer's serial number

Your computer's serial number is a unique identifier printed or engraved on your machine. It looks like a string of letters and numbers — usually between 8 and 20 characters long. The location depends on whether you have a desktop or laptop, and what brand you own.

For most laptops, the serial number is on a sticker on the bottom of the machine. Flip your laptop over, and look for a white or silver label. The serial number is usually listed there alongside the model number and other information. On some newer laptops — particularly thin models — the sticker may be on the back edge or inside the battery compartment.

Desktop computers vary more widely. On Dell desktops, check the back panel or the side of the tower. HP and Lenovo desktops often have the serial number on the back. Apple computers (both Mac laptops and desktops) print the serial number on the bottom of the machine or inside the battery bay. If you cannot find a physical sticker, you can also look it up through your operating system, which is often faster.

Key Takeaways

  • Laptop serial numbers are almost always on a sticker on the bottom of the machine.
  • Desktop serial numbers are usually on the back panel or side of the tower, but the exact location varies by brand.
  • You can find your serial number through Windows Settings, System Preferences on Mac, or Linux terminal commands without opening your computer.
  • Write down or photograph your serial number and keep it in a safe place — you will need it for warranty claims and theft recovery.
  • The serial number is different from the model number; both appear on the same sticker but serve different purposes.

Finding your serial number in Windows

If you cannot locate the physical sticker or prefer not to flip your laptop over, Windows stores your serial number in the system information. Open the Start menu and type System Information into the search box, then click the result. A window will open showing your computer details.

Look for the field labeled System Serial Number or Serial Number. On some Windows machines — particularly Lenovo, Dell, and HP — it may also appear as Service Tag or Product ID. Write down the exact string of characters. If you see multiple numbers on this screen, the serial number is the one specifically labeled as such, not the Product ID or UUID.

An alternative route is to open Command Prompt (search for cmd in the Start menu) and type the command wmic bios get serialnumber, then press Enter. The serial number will appear on the next line. This method works on almost all Windows machines and is often faster than navigating menus.

Finding your serial number on a Mac

On Mac computers, click the Apple menu in the top-left corner and select About This Mac. A window will open showing your computer's specifications. Look for the field labeled Serial Number — it appears near the top of the window, usually below the Mac model name.

You can also find this information by going to System Preferences (or System Settings on newer macOS versions), clicking General, and then About. The serial number will be displayed there as well. On older Mac models, the serial number is also printed on the bottom of the machine or inside the battery compartment, though accessing it through the system is usually simpler.

Finding your serial number on Linux

Linux machines store serial number information in the system firmware, and the method to retrieve it depends on your specific distribution and hardware. Open a terminal window and type the command sudo dmidecode -s system-serial-number, then press Enter. You may be asked to enter your password. The serial number will appear on the next line.

If that command does not work, try cat /sys/class/dmi/id/product_serial. Different Linux distributions and manufacturers store this information in slightly different places, so if neither command returns a result, check your computer's physical stickers or consult your manufacturer's support documentation for your specific model.

Why you need your serial number

Your serial number is essential for several practical situations. If your computer is stolen, providing the serial number to police and your insurance company helps them identify and recover your machine. Manufacturers use it to verify warranty coverage — if your computer fails within the warranty period, you will need the serial number to prove you own the device and when you purchased it.

Tech support teams also ask for your serial number to pull up your specific machine's history and configuration. If you send your computer in for repair, the serial number ensures the right device is returned to you. Some software licenses are tied to serial numbers as well, particularly for business or professional software.

Keeping your serial number safe

Once you have located your serial number, write it down or take a clear photograph of the sticker. Store this information somewhere you can find it later — a notes app on your phone, a document in cloud storage, or a physical notebook. Do not store it only on the computer itself, since you may need it if that computer is lost or damaged.

If you are selling or giving away your computer, do not share the serial number with the buyer unless absolutely necessary. The serial number can be used to claim ownership of a device, so treat it similarly to how you would treat a vehicle identification number on a car.

Frequently Asked Questions

Is the serial number the same as the model number?

No. The model number identifies what type of computer you have (for example, "Dell XPS 13"), while the serial number is unique to your specific machine. Both usually appear on the same sticker, but they serve different purposes. The model number tells a technician what kind of device you own; the serial number proves which individual device is yours.

What if I cannot find a serial number sticker on my computer?

Some computers, particularly very thin laptops or older machines, may not have a visible sticker. Use the Windows, Mac, or Linux method described above to retrieve it from your system. If the system commands do not return a result, contact your manufacturer's support team with your model number — they can help you locate it or provide an alternative identifier.

Can I look up a computer's history using its serial number?

Only the manufacturer can access detailed history tied to a serial number, and they will only share it with the registered owner. You cannot look up whether a used computer is stolen or has outstanding repairs just by knowing the serial number. If you are buying a used computer, ask the seller for proof of purchase and contact the manufacturer directly if you have concerns about the device's history.

Do I need my serial number to get warranty service?

Most manufacturers ask for it, though some will also accept your proof of purchase or the email address associated with your account. Having the serial number on hand makes the process faster. If you have lost your receipt, the serial number becomes more important for proving you own the device and when you purchased it.

What should I do if my serial number sticker is damaged or unreadable?

Retrieve it from your system using the Windows, Mac, or Linux commands described above — this is the most reliable method. If the system commands do not work, contact your manufacturer's support team with your model number and proof of purchase. They can verify your ownership and provide you with your serial number or an alternative identifier for warranty and support purposes.