How to Find the Serial Number on Any Device

Every device you own has a serial number — a unique identifier assigned by the manufacturer that distinguishes your specific unit from every other device of the same model. Knowing how to locate it is one of those practical skills that pays off exactly when you need it most: filing a warranty claim, reporting a theft, getting technical support, or verifying authenticity before buying second-hand.

The challenge is that serial numbers aren't stored in one universal place. Where you find yours depends entirely on what type of device you have, what operating system it runs, and how old it is.

What Is a Serial Number and Why Does It Matter?

A serial number is a manufacturer-assigned alphanumeric string — typically between 8 and 20 characters — that identifies a single production unit. Unlike a model number, which applies to an entire product line, a serial number is unique to your device.

Common reasons you'll need it:

• Registering a product for warranty coverage
• Requesting repairs or replacement parts
• Verifying a device hasn't been reported stolen
• Confirming authenticity of a refurbished or used device
• Contacting manufacturer support for troubleshooting

Finding the Serial Number on a Physical Device 🔍

The most reliable method is checking the device itself. Manufacturers almost always print or engrave the serial number directly on the hardware.

Common physical locations by device type:

For devices with removable batteries (common on older phones), powering down and removing the battery often reveals a label underneath. On newer sealed devices, the serial number is typically on the rear casing near the regulatory information text — look for "S/N" or "Serial No."

Finding the Serial Number Through Software

When a sticker is worn, missing, or simply hard to read, software-based lookup is often faster and cleaner.

Windows

Open Settings → System → About. Under "Device specifications," you'll see a Device name and related info. For the serial number specifically, the more reliable method is:

1. Press Windows + R, type cmd, press Enter
2. Run: wmic bios get serialnumber

This pulls the serial number from the device's firmware (BIOS/UEFI) and works on most laptops and desktops. On some custom-built PCs, this field may return "Default String" or be blank — meaning the motherboard manufacturer didn't populate it.

macOS

Go to Apple Menu → About This Mac. In older macOS versions, the serial number appears directly on that screen. In macOS Ventura and later, navigate to System Settings → General → About and look for "Serial Number" in the list.

Alternatively, click on the serial number field — it typically allows copying to clipboard, which is useful when entering it into a support form.

iPhone and iPad

Go to Settings → General → About and scroll to Serial Number. On older iOS versions this appears near the top of the About screen. You can also find it in iTunes or Finder on a connected Mac or PC by selecting your device.

Android

The path varies by manufacturer, but the general route is Settings → About Phone → Status (or About Phone → Serial Number). Samsung devices often place it under Settings → About Phone → Software Information or visible directly on the About Phone page. The label may say Serial Number, S/N, or sometimes IMEI (which is a different identifier specific to cellular radios, not the same as the device serial number).

Chrome OS

Click the system clock in the bottom-right corner → Settings → About Chrome OS → Diagnostics. The serial number also appears on a sticker on the bottom of the Chromebook.

Checking the Original Packaging or Documentation

If the device is new or you kept the box, the serial number is almost always printed on a label on the outside of the packaging — usually near the barcode. This is particularly useful for:

• Devices that are sealed or difficult to open
• Smart home devices where the label is in an awkward location
• Situations where the physical sticker on the device itself has worn off

Manufacturer invoices, receipts, and warranty registration emails also frequently include the serial number.

When the Serial Number Is Hard to Find 📋

A few situations complicate the process:

• Custom-built PCs may not have a system-level serial number, since the "device" is an assembly of parts from different manufacturers. In this case, individual components (motherboard, GPU, drives) each have their own serial numbers, accessible through tools like HWiNFO, CPU-Z, or Speccy.
• Very old devices may have labels that have peeled or faded completely. In some cases, contacting the original retailer with proof of purchase is the only recovery option.
• Refurbished devices sometimes have replaced outer casings, meaning the physical label no longer matches the software-reported serial number — a detail worth checking when buying used hardware.

Serial Number vs. Other Identifiers

It's worth knowing how a serial number differs from related identifiers you might encounter:

• Model number — Identifies the product line, not your specific unit
• IMEI — A cellular-specific identifier for mobile devices; used by carriers, not the same as the serial number
• MAC address — A network hardware identifier, not a device serial number
• SKU — A retailer or inventory code, typically not used for manufacturer support

The right identifier to use depends on the context — warranty claims typically require the serial number, while carrier unlocking or network troubleshooting often requires the IMEI.

Where yours lives, and which method works best, comes down to exactly which device you're dealing with and how it's configured.