Check a Warranty by Serial Number
Most laptop makers have a free page where you type in the serial number and see when the warranty ends. This page links the official one for six makers, along with where to find the serial and how long the standard cover is.
Apple warranty check
Open Apple's checkWhere the serial is. Printed on the underside of a Mac, and on the box. On the Mac: Apple menu > About This Mac. After a logic board repair the printed number may no longer match, so use this one.
Standard warranty. One year (Apple’s limited warranty), on top of any rights under consumer law. AppleCare extends it.
Several at once. No public bulk check. With Apple Business, the admin portal shows coverage for each device you manage.
Sources: support.apple.com, support.apple.com
Dell warranty check
Open Dell's checkWhere the serial is. Dell calls it the Service Tag. It’s etched or on a sticker on the bottom of a laptop. On the laptop: the SupportAssist app shows it on its main screen.
Standard warranty. Set when you buy: anything from 90 days to five years or more, as shown on the invoice.
Several at once. Dell Command | Warranty, a Windows tool, reads a CSV file of Service Tags and gives you the warranty status for each one.
Lenovo warranty check
Open Lenovo's checkWhere the serial is. On a label on the device. On the laptop: the Lenovo Vantage app, or “Detect my product” on Lenovo’s support site.
Standard warranty. Depends on the model and where it was bought. The lookup shows yours.
Source: support.lenovo.com
HP warranty check
Open HP's checkWhere the serial is. On a label on the laptop, and on the box. On the laptop: press fn + esc on the built-in keyboard for the System Information window.
Standard warranty. One year for most laptops, up to three on some business models.
Several at once. The check page has a “multiple products” tab: add a row per serial and check them together.
Sources: support.hp.com, hp.com
Microsoft warranty check
Open Microsoft's checkWhere the serial is. On a Surface Laptop, under the keyboard near the hinge. On a Surface Pro or Go, under the kickstand. On the device: in the Surface app under Device information, or in Settings > System > About.
Standard warranty. At least one year on business (commercial) Surface devices. For a consumer Surface, the check page shows yours.
Several at once. The Surface Management Portal shows covered and expiring devices, if you use Intune.
Sources: support.microsoft.com, learn.microsoft.com, learn.microsoft.com
ASUS warranty check
Open ASUS's checkWhere the serial is. On a label on the laptop, the box or the warranty card. On the laptop: the MyASUS app.
Standard warranty. Printed on the sticker on the back: 24M means 24 months, 36M means 36.
How do I find the serial number on a Windows laptop?
On any Windows PC, open PowerShell and run the command below. It reads the serial the maker stored in the laptop's firmware. The older wmic bios get serialnumber has been removed from current versions of Windows 11.
Get-CimInstance -ClassName Win32_BIOS | Select-Object -Property SerialNumberWhy does the check page ask me to paste the serial?
None of these makers let a link fill in the serial number for you, and Apple and HP add a CAPTCHA, so you paste it in yourself, on their site rather than here.
Once you have the date, note it against that device in your list, or put it in our warranty expiry tracker so you can see what's ending soon. If something has already broken, our guide to filing a warranty claim covers the rest.
Rather not look them up one by one?
Forward the receipt to AssetJay and it files the purchase date with the asset, plus the serial if the receipt lists one. If the receipt doesn't give a warranty length it assumes one year, and it emails you 30, 7 and 1 day before the warranty ends. Each asset page links to its maker's check, with a button to copy the serial.