Sherpah_

The Safe Private Plugin set up a members-only area on your WordPress and protect your content, pages and resources from public access. 
Only registered users will be able to browse your site. The plugin will redirect all others users to the login page of your blog. 
Deny access to unregistered users, perfect for a private website, helpful during a blog maintenance and useful for developers…
<ul>
<li>Membrers-only area</li>
<li>Members only feed</li>
<li>No template modifications</li>
<li>Fast, Safe and secure…</li>
</ul>
Author Plugin link page: <a href="http://www.sherpah.net/wordpress/plugin-safe-private/" rel="nofollow ugc">Safe Private</a>

Safe Private

A Private Wordpress, a Members-only Website, helpful during a site maintenance and useful for developers...

Takashi Kitajima

MW IP Denied allows you to set access restrictions by IP address for each article. When access is restricted and there is template-access-denied.php, MW IP Denied load it.
You can also use short code for controlling the access on a part of the article.
Only the IP address that you specify can access. 
[mw-ip-allow allow=”IPAddress,…”]text[/mw-ip-allow]
Only the IP address that you specify can not access. 
[mw-ip-deny deny=”IPAddress,…”]text[/mw-ip-deny]

MW IP Denied

MW IP Denied allows you to set access restrictions by IP address for each article.

Safe Private vs MW IP Denied