Product Key Checker - Microsoft

Open Command Prompt as Administrator and run:

cscript slmgr.vbs /dli Or to input a specific key for validation:

So how do legitimate users check their keys? You have three real options. This tells you what edition the key is for, not if it’s blocked by Microsoft.

Maybe you bought a cheap key online. Maybe you found an old sticker on the bottom of a laptop. Or perhaps you’re trying to transfer a license to a new PC.