If you have an Apple Device you can check your warranty status here: https://checkcoverage.apple.com
If you have a Microsoft Device you can check your warranty status here: https://mybusinessservice.surface.com
If you have an ASUS Device you can check your warranty status here: https://www.asus.com/au/support/warranty-status-inquiry/
If you have a Lenovo Device you can check your warranty status here: https://pcsupport.lenovo.com/au/en/warranty-lookup#/
If you have an HP Device you can check your warranty status here: https://support.hp.com/au-en/check-warranty