You can inspect a list of all devices that have been linked to your Plex account. You can see the list in the Plex Web App.
From your Plex Account
To open the Plex Web App from your Plex account:
- Visit plex.tv
- If not already signed in, click Sign In and sign in to your Plex account
- Once signed-in, click – the Plex Web App loads
- Click then choose Authorized Devices