Masoud Binaei

This plugin allow WordPress to detect Real visitors IP Address when WordPress is behind of Reverse Proxy, Load Balancer or CDN. 
It will start working as soon as you activate it.
It is also compatible:
<ul>
<li>Cloudflare.com</li>
<li>geniusguard.com</li>
<li>central-hosting.com</li>
<li>incapsula.com</li>
<li>sucuri.net</li>
<li>barracuda.com</li>
<li>f5.com And Other…</li>
</ul>

Real IP Detector

Very good

This plugin allow WordPress to detect Real visitors IP Address.

brijeshk89

Smart Maintenance Mode is a plugin which allows you to set your site to maintenance mode so that your readers see the Coming Soon page while you can see the actual development of your site. You can create ranges and define the IP range which will see the actual site using Smart Maintenance Mode.
Features in Smart Maintenance Mode include:
<ul>
<li>Enable/Disable Maintenance Mode</li>
<li>Add/Remove Custom HTML content</li>
<li>Add/Remove a Countdown to the time when your site will be live</li>
<li>Add/Remove custom messages for Maintenance Mode page</li>
<li>Add/Remove custom images for Maintenance Mode page</li>
<li>Allow User roles to access actual site when Maintenance Mode is enabled</li>
<li>Allow your IP to access actual site when Maintenance Mode is enabled</li>
<li>Create IP ranges</li>
<li>Delete IP ranges</li>
<li>Enable/Disable IP ranges</li>
<li>Completely FREE</li>
<li>Licensed under GNU GPL version 3</li>
<li>Safe & Secure</li>
</ul>

Smart Maintenance Mode

Looks nice but doesn't work as advertised.

undefined index: disable_smm in /var/www/wordpress/wp-content/plugins/smart-maintenance-mode/smart-maintenance-mode.php on line 670

Errors and IP address not working

Smart Maintenance Mode allows you to put your site under maintenance mode for others and you can see the actual developement of your site by allowing  …

Real IP Detector vs Smart Maintenance Mode