[@robkk Moderator 11 years, 1 month ago]

Sorry for the late reply, but I couldn’t find a soltution to find a specific user with the ID of 1000.

This shows recently registered users but you would have to keep track of who is the 1000th user.

https://wordpress.org/plugins/new-user-dashboard/

Other than that it may be custom development and you may need to hire a developer.