“Restrict Registration” is a plugin for WordPress that allows you to control 
who is registering on your blog. This plugin uses simple blacklists and 
whitelists to define who can register for your blog, and who is restricted. Use 
simple literal matching, flexible asterisk wildcard matching, or powerful 
regular expression matching: it’s your choice! The options page is clear and 
easy to use. Set your lists, and you’re done!
This plugin was inspired by WP-Deadbolt, but has been completely rewritten and 
redesigned, and several new features have been added.

Restrict Registration

Use simple blacklists and whitelists to control who can and cannot register on your blog.

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Allows to restrict the access of specific posts and pages to intranet only.
<ul>
<li>Adds an extra option to pages and posts in the admin panel where contents may be marked as restricted.</li>
<li>Intranet can defined by domain names and IP ranges (address/mask).</li>
</ul>

Intranet Restriction for Posts and Pages

Allows to restrict the access of specific posts and pages to intranet only.

Restrict Registration vs Intranet Restriction for Posts and Pages