How to Check the Serial Number of Your Laptop

Every laptop has a unique serial number — a manufacturer-assigned identifier that's essential for warranty claims, tech support, theft recovery, and tracking down compatible replacement parts. The tricky part is that where you find it depends entirely on your operating system, your laptop brand, and sometimes even the specific model generation.

Here's every reliable method, broken down clearly.

Why Your Laptop's Serial Number Matters

Before diving into the how, it's worth understanding what this string of characters actually does. A serial number is unique to your individual unit — not just your model. Two identical laptops bought on the same day will have different serial numbers.

You'll need it when:

• Registering your device for warranty coverage
• Contacting manufacturer support
• Reporting a stolen laptop to authorities
• Ordering model-specific replacement parts or drivers
• Verifying a second-hand laptop's history

Method 1: Check the Physical Label on the Laptop

The most universal starting point is the physical label on the device itself.

Where to look:

• Bottom of the laptop — the most common location; look for a sticker with a barcode and alphanumeric string labeled "S/N," "Serial," or "Serial No."
• Inside the battery compartment — on older laptops with removable batteries, the serial number is often printed underneath the battery itself
• Under the keyboard bezel or near the hinge — less common, but some ultrabooks and business-class laptops place it here
• On the original box — if you kept the packaging, the serial number is printed on the label alongside the model number

On many modern thin laptops, the text is extremely small. Good lighting and a camera zoom can help. 🔍

Method 2: Find the Serial Number in Windows

If the sticker is worn, missing, or just hard to read, Windows has several built-in ways to pull the serial number from the system firmware.

Using Command Prompt or PowerShell

This is the fastest software method on Windows:

1. Press Windows + R, type cmd, and hit Enter
2. In the Command Prompt window, type:

wmic bios get serialnumber 

3. Press Enter — the serial number appears on the next line

You can run the exact same command in PowerShell if you prefer. The result pulls directly from the BIOS/UEFI, so it reflects whatever the manufacturer encoded at the factory.

Using System Information

1. Press Windows + R, type msinfo32, and press Enter
2. In the System Information window, look for System SKU or scroll to find the serial number field

Note: Not all manufacturers populate this field consistently. The wmic command tends to be more reliable.

Using Settings (Windows 11)

Some Windows 11 laptops display the serial number directly in Settings → System → About, though this varies by manufacturer and is not universally available.

Method 3: Find the Serial Number on macOS

Apple makes this relatively straightforward.

Option A — About This Mac:

1. Click the Apple menu (top-left corner)
2. Select About This Mac
3. The serial number is listed directly in that window

Option B — System Information:

1. Hold Option and click the Apple menu
2. Select System Information
3. Under the Hardware Overview section, find Serial Number (system)

Option C — Terminal:

system_profiler SPHardwareDataType | grep Serial 

This returns the same number as the GUI methods.

On MacBooks, the serial number is also engraved on the bottom case near the regulatory markings — though it's small and may require good lighting to read.

Method 4: Check the BIOS/UEFI Directly

If your operating system won't boot or you're troubleshooting before setup, you can access the serial number through the BIOS or UEFI firmware interface.

1. Restart your laptop and press the firmware key during startup — commonly F2, F10, F12, Del, or Esc depending on the manufacturer
2. Navigate to the System Information or Main tab
3. The serial number is typically listed here alongside the model name and BIOS version

This method works regardless of which OS is installed and is useful for freshly wiped or non-booting machines.

Method 5: Use the Manufacturer's Support Tool

Many laptop brands ship their own system management software that surfaces this information without any command-line knowledge:

Open the relevant app and navigate to Device Information or My Device — the serial number is almost always displayed prominently.

Variables That Affect Where You'll Find It 🖥️

Not every method works equally well in every situation. A few factors shape which approach is most practical:

• OS version — older Windows versions (7, 8) don't support all the same commands; macOS Ventura and later handle it differently than Mojave
• Laptop age — older machines may have worn-off physical labels and BIOS interfaces that don't expose serial data via software
• Manufacturer consistency — some brands encode the serial in firmware reliably; others don't populate that field at all, making the physical label the only accurate source
• Condition of the device — a wiped, corrupted, or unbootable system may limit you to physical inspection or BIOS access
• OEM customization — business-line laptops (ThinkPad, EliteBook, Latitude) often expose more system data in firmware than consumer models

When Software and Hardware Disagree

Occasionally, the serial number returned by a software command won't match the physical label. This can happen after a motherboard replacement, a firmware flash gone wrong, or on certain refurbished units where the board was swapped. In those cases, the physical label on the original chassis is what most manufacturers consider the authoritative identifier for warranty and support purposes — though a replaced motherboard may carry its own service tag.

Which serial number matters in your specific situation depends on what you're trying to accomplish — a warranty claim, a parts order, or a police report each point to slightly different answers.