Meet Sessions for WordPress: a free plugin that lets you apply limits to visitor sessions on your site. You can use it to limit concurrent sessions based on IP address, country, and other factors. Sessions also lets you protect your login page by blocking certain IP ranges. Want to limit users to a certain number of users? No problem.
Sessions for WordPress can give you insight into active sessions, users, login/logout events and password resets. It also supports WP-CLI commands. You can change standard cookie duration, login rules, and other settings from the backend.