wp-ip.php

<?php

/**
 * Plugin Name: WP IP
 * Plugin URI:  https://github.com/asmbs/wp-ip
 * Version:     1.1.0
 * Description: See the IP address of your WordPress instance, right in your admin bar (if you're an administrator).
 * Author:      The A-TEAM
 * Author URI:  https://github.com/asmbs
 * License:     MIT
 * License URI: http://opensource.org/licenses/MIT2
 */

/**
 * @param  WP_Admin_Bar  $wp_admin_bar
 */
function admin_bar_ip($wp_admin_bar)
{
    if (!current_user_can('manage_options')) {
        return;
    }

    $wp_admin_bar->add_node([
        'id'     => 'wp-ip',
        'title'  => sprintf(__('Currently located at <b>%s</b>'), $_SERVER['SERVER_ADDR']),
        'parent' => 'top-secondary'
    ]);
}

// Register the hook
add_action('admin_bar_menu', 'admin_bar_ip', 10);