How to find logged IP address from SproutForms sent email
The ipAddress of the user submitting the form is stored in the sproutforms_entries.ipAddress column.

Right now, you'd have to look in the database or create a custom report to view the data. I've opened an issue to add that data to the default report so it can be seen more easily:
https://github.com/barrelstrength/craft-sprout-forms/issues/275

You can use Sprout Reports to create a custom report integration using Twig, PHP, or MySQL.