Product keys vary if the software was purchased as part of a suite rather than a standalone product: Autodesk 2016 Product Keys - Microsol Resources
Check the back of the DVD case or the USB packaging if you have a physical copy.
: This is a static code used to differentiate between the standalone product and those sold as part of a suite. For instance, while the standalone Civil 3D 2016 key is 237H1 , the key for the AutoCAD LT Civil Suite 2016 is 545H1 . autocad civil 3d 2016 serial number product key
If you use a legitimate 2016 serial number today, you cannot:
Log in using your company’s Contract Manager or Software Coordinator credentials. Click on the or All Products and Services tab. Product keys vary if the software was purchased
For advanced users: Press Win + R , type regedit , and navigate to the Registry key corresponding to Civil 3D 2016 (often found under HKEY_LOCAL_MACHINE\SOFTWARE\Autodesk\AutoCAD\R20.1\ACAD-F000:409 ).
Log into your official Autodesk Account to find your legitimate serial numbers, seat assignments, and activation paths under the "Management" tab. If you use a legitimate 2016 serial number
If you are installing Civil 3D 2016 as part of an Autodesk Infrastructure Design Suite, you must use the product key assigned to that specific suite instead: Infrastructure Design Suite Premium 2016: Infrastructure Design Suite Ultimate 2016: 787H1 Locating Your Serial Number
If you are installing Civil 3D 2016 as a standalone product, the key you almost certainly need is 237H1 .