Chris Dennis

The IP Tools plugin provides a number of ways to control the content displayed 
to the visitor depending on whether they have connected to the server 
via IPv4 or IPv6.
IPv6 is slowly being adopted, and will eventually replace IPv4. 
There is plenty of information on this topic on the internet — 
on <a href="https://en.wikipedia.org/wiki/IPv6" rel="nofollow ugc">Wikipedia</a>, for example.
Suggestions for more things to add to this tool box will be welcome.
<h4>Shortcodes</h4>
Place these shortcodes in your posts and pages.
<ul>
<li><code>[ipt_address]</code> is replaced by the visitor’s IP address.</li>
<li><code>[ipt_ipv6logo width=80px]</code> is replaced by an IPv6 logo (from the 
<a href="http://www.worldipv6launch.org/" rel="nofollow ugc">World IPv6 Launch</a> website) 
displayed with the given width. The default width is 64 pixels: the width can be 
specified in any <a href="http://www.w3.org/TR/css3-values/#lengths" rel="nofollow ugc">CSS length unit</a>.</li>
<li><code>[ipt_ipv6only]...text...[/ipt_ipv6only]</code> displays the text only if IPv6 is in use.</li>
<li><code>[ipt_ipv4only]...text...[/ipt_ipv4only]</code> displays the text only if IPv4 is in use.</li>
</ul>
Other shortcodes can be nested within these last two.
Note that shortcodes can be used in text widgets, but only if the theme includes 
the necessary filter. 
If shortcodes in widgets are not working in your current theme, 
you need to modify your WordPress theme and put the following 
code into the “functions.php” file of the theme.
<pre><code><?php add_filter('widget_text', 'do_shortcode'); ?>
</code></pre>
Thanks to the <a href="http://www.lost-in-code.com/platforms/wordpress/wordpress-shortcode-in-text-widget/" rel="nofollow ugc">Lost in Code website</a> for this tip.
<h4>CSS Classes</h4>
IP Tools creates CSS which can be used to hide any HTML element depending on whether IPv4 or IPv6 is in use.
It defines classes <code>ipt_ipv4only</code> and <code>ipt_ipv6only</code> which basically do what they say: the element 
with that class is modified with <code>display: none</code> if the visitor’s IP address is in the other IP domain.
For example, if you included the following HTML in a page, post, or widget 
only the relevant section of text would be displayed to the user.
<pre><code><div class="ipt_ipv4only">
 You've come to this webpage via IPv4 -- 
that's so last century.
</div>
<div class="ipt_ipv6only">
 Well done! You're enjoying the modern wonders of IPv6.
</div>
</code></pre>
<h4>Widgets</h4>
So far, IP Tools just provides one small widget called ‘IP Tools Address’ that displays the visitor’s IP address — something like 
‘IPv4 address: 12.34.56.78’ or ‘IPv6 address: 2001:0db8:85a3:0000:0000:8a2e:0370:7334’.
The title of the widget can be changed from its default value of ‘IP Tools’.

IP Tools

IP Tools is a small collection of useful shortcodes, widgets, and classes related to IP addresses.

ppatux

Simple IPv6 detector widget for WordPress to show if user is connecting with IPv6 or IPv4.
Additionaly, it makes a link to a whois service with the ip address.
It was born because of my own blog. I needed to include a little box that shows users ip and different messages depending on the ip version.
The idea behind this is to promote and leave a way to discover and make sense about the ipv4 address space limits.

IPv6 Detector

Simple IPv6 detector widget for WordPress to show if user is connecting with IPv6 or IPv4.

IP Tools vs IPv6 Detector