Alis

WP-Flock is a plugin that provides LiveJournal-like custom security groups for posts and pages. It’s more flexible than Post Levels, and less complicated than Role Scoper. Plus it hooks into <a href="http://beta.void-star.net/projects/journalpress/" rel="nofollow ugc">JournalPress</a>; what more could you want?
It is currently in its “stable beta” stage, and as such some features may not be available or a little wonky.
The latest updates about the plug-ins development can be found <a href="http://beta.void-star.net/category/geeking/wordpress/wp-flock/" title="WP-Flock @ beta.void-star.net" rel="nofollow ugc">in the project blog</a>.
<h4>Version 0.1</h4>
<ul>
<li>It’s alive! It’s alive!</li>
<li>Basic friends-locking group functionality completed.</li>
</ul>

WP-Flock

A plugin that provides LiveJournal-like custom security groups for posts and pages.

10up

Jeffrey Paul

Oomph, Inc.

Taylor Lovett

Jake Goldman

Siddharth Thevaril

Limit access your site to visitors who are logged in or accessing the site from a set of specified IP addresses. Send restricted visitors to the log in page, redirect them, or display a message or page. A great solution for Extranets, publicly hosted Intranets, or parallel development / staging sites.
Adds a number of new configuration options to the Reading settings panel as well as the Network Settings panel in multisite. From these panels you can:
<ul>
<li>Enable or disable site restriction</li>
<li>Change the restriction behavior: send to login, redirect, display a message, display a page</li>
<li>Add IP addresses to an unrestricted list, including ranges</li>
<li>Quickly add your current IP to the unrestricted list</li>
<li>Customize the redirect location, including an option to send them to the same requested path and set the HTTP status code for SEO friendliness</li>
<li>Define a simple message to show restricted visitors, or select a page to show them – great for “coming soon” teasers!</li>
</ul>

Restricted Site Access

This plugin serves what it says. I was trying to solve an issue to restrict my site to specific IP addresses. This plugin solves it. Kudos team. 

Super Helpful Tool

Thanks for this. Works 100%, super helpful. 

Nice work

I have activated the plugin as a replacement for a maintenance plugin on a WordPress instance that I use as an extranet. It does exactly what I was looking for. The settings are absolutely sufficient and completely fulfill their purpose.
Great !!!

Great Plugin for Intranet/Extranet

Limit access to visitors who are logged in or allowed by IP addresses. Includes many options for handling blocked visitors.

WP-Flock vs Restricted Site Access