Roberto Cabrera

<p>Setting your website into maintenance mode has never been easier. This plugin will allow you to set your website to maintenance mode by IP address. Only your allowed IPs will have access to your site.</p>
<p>This plugin includes a default template. You have control into what to show to your visitors.</p>
<h4>Features include</h4>
<ul>
<li>Allow more than one IP to access your site while on maintenance mode</li>
<li>Redirect unauthorized visitors to a page (default) or to an specific url.</li>
<li>Customize the contents of the page your visitors will see while your site is on maintenance mode</li>
<li>Show a countdown timer</li>
<li>Select from amazing backgrounds or upload your own background image to use.</li>
<li>Display links to your social profiles</li>
<li>Allow visitors to subscribe to your mailing list ( Provided by MailChimp ) while your site is on maintenance mode.</li>
<li>Securely avoid spam by using Google reCaptcha with your Subscribe Form.</li>
</ul>
<h3>To Setup The Plugin</h3>
<p>To learn more visit <a href="https://clenterprisesllc.freshdesk.com/support/solutions/articles/44001606789-maintenance-mode-by-ip-plugin-setup" rel="nofollow ugc">https://clenterprisesllc.freshdesk.com/support/solutions/articles/44001606789-maintenance-mode-by-ip-plugin-setup</a>.</p>
<h3>Support</h3>
<p>Create support tickets here <a href="https://clenterprisesllc.freshdesk.com/support/tickets/new" rel="nofollow ugc">https://clenterprisesllc.freshdesk.com/support/tickets/new</a>.</p>


Maintenance Mode by IP Address

Plugin to allow you to set your site to maintenance/coming soon mode by limiting its access to an IP address.

Ipstenu (Mika Epstein)

JohnnyWhite2007

<p>Spam is one thing, but trolls and sock puppets are another.  Sometimes people just decide they’re going to be jerks and create multiple accounts with which to harass your honest users.  This plugin helps you fight back by logging the IP address used at the time of creation.</p>
<p>Log into your WP install as an Admin and you can look at their profile or the users table to see what it is. For security purposes a user’s own IP is not displayed to them when they look at their own profile.</p>
<ul>
<li><a href="https://ko-fi.com/A236CEN/" rel="nofollow ugc">Donate</a></li>
</ul>
<h3>Privacy Notes</h3>
<p>This plugin adds additional data to a new user’s <code>wp_usermeta</code> data under the <code>signup_ip</code> key. This data is directly tied to the user account, and is only editable via the database. Should a user account be deleted from the site, the data will be automatically deleted.</p>
<p>No external data is transmitted, it all stays on your install.</p>


Register IPs

Does exactly waht it says

When a new user registers, their IP address is logged. Supports multisite and single site!

Maintenance Mode by IP Address vs Register IPs