Below are the links for the various manufacturers to check the status of your warranty.
- Apple - https://checkcoverage.apple.com/
- Dell - https://www.dell.com/support/home/us/en/04?app=warranty
- Lenovo - https://pcsupport.lenovo.com/us/en/warrantylookup
- HP - https://support.hp.com/us-en/checkwarranty
- Safeware - https://www.safeware.com/lookup