Logs the IP of the user when they register a new account. View the signup IP by going to the Users menu or by editing that user.
Register IP logs the new user's signup IP in the database under wp_usermeta with the key of signup_ip. You would be able to see it in WordPress by logging into WordPress with an account that has access to the users menu. You will be able to see the IP listed with each user and in their profile when you go to edit it. For security purposes their IP is not displayed to them when they see their profile. This plugin was made to assist those that are tired of trying to match a IP up with the persons registered date so that the administrator can block the IP from making more accounts or access the site. Especially useful if you block a problematic person that spams your blog.