There is no way to get a list of the specific computers. Only you can know which ones you authorized.
Computers and devices are separate things. Any computer you may have owned in the past where you logged in with your Apple Id and authorized it, will remain authorized until you de-authorize it even if you wipe the computer and no longer own it.
You can de-authorize them all, and then authorize the ones you still have though.
De-Authorization does not affect iOS devices, Apple TVs or any third party devices such as smart TVs consoles or streaming devices. But it will affect authorized Mac and PC computers you may have.
click here ➜ Authorize or deauthorize your computer for iTunes Store purchases - Apple Support