Unlike the product key, the serial number is unique to your account or purchase. You can locate it using these three methods:
Ensure you aren't confusing the standard AutoCAD key with a specialized "toolset" key (like AutoCAD Mechanical).
If you have a legacy USB or DVD box set, the serial number is usually located on the back of the packaging or on a sticker inside the case. Step-by-Step Activation Guide
Enter your unique serial number and the product key 001J1 .
Log in to your Autodesk Account. Navigate to "All Products and Services," find AutoCAD 2018, and click "View Details" to see your serial number.
Autodesk uses a two-step verification system for perpetual and subscription licenses: