by pcoitinho on WordPress.org
Only Admins is a minimal plugin that restricts your entire WordPress site to Admins.
Best used as a MU-Plugin on Development and Staging sites.
Block user access without deleting accounts. Prevent specific users from logging in while preserving their data and content.
Easily and safely change the WordPress login URL to anything you want. Makes wp-admin and wp-login.php inaccessible for enhanced security.
Mask admin user IP addresses - both historical data and future activity