Netflix’s password sharing crackdown is here - and it costs $7.99 per month
We use information such as IP addresses, device IDs, and account activity to determine whether a device signed into your account is part of your Netflix Household.
We do not collect GPS data to try to determine the precise physical location of your devices.
If a Netflix Household hasn’t been set, we will automatically set one for you based on IP address, device IDs, and account activity.
You can always update your Netflix Household from a TV by connecting to your internet and following the steps above.
Source: The Verge