How to find vendor and model of unknown drivers

Use PCI database (online website)

1. go to the device manager
2. open the properties of the unknown device
3. click on details → Hardware IDs
4. extract the vendor ID and the device ID like shown in the screenshot

5. search on the PCI database for the vender and database ID.
   The database is regularly updated by users. Scroll down Intel's page as an example.
   The results will show a driver name which can be googled

   

Use Unknown Devices (portable offline tool)

The portable tool even shows old drivers which are normally only visible if you type SET DEVMGR_SHOW_NONPRESENT_DEVICES=1 in an elevated CMD prompt before opening the device manager.

Use DriverIdentifier (offline tool with online database)

Install it or extract it with UniExtract if you need a portable version. It will scan your drivers and compare them with its online database.