rammichael

From the Cloudflare Support website:
Q: Why do my server logs show Cloudflare’s IPs using Cloudflare?
A: When you sign on to Cloudflare the way your logs are displayed will change because Cloudflare 
 acts as a proxy. This means that your visitors are routed through the Cloudflare network. This 
 allows Cloudflare to stop attacks before they reach your network. It also allows Cloudflare to 
 speed up page load time by more efficiently routing packets and, more importantly, caching 
 static resources (images, javascript, css, etc.) on a very fast connection. However, as a 
 result, the connecting IP will always come from the Cloudflare network.
As a result, commenters’ IP will also be masked by Cloudflare. Luckily, Cloudflare sends the real 
user’s IP in a separate header. This plugin saves it, as well as the user’s geo-location (also 
provided by Cloudflare), and displays this information in the admin panel.
Note that when the blog is served directly to the internet (not through Cloudflare), anyone can 
spoof any IP address and geo-location by specifying any value in the request headers.

Real IP and Geo for Cloudflare

The plugin saves and displays visitors' real IP and location, instead of Cloudflare's.

guido

Remove IP it’s a really-really-simple plugin to not log the IP address from the people that comment on your wordpress 
installation.
This plugin will be useful to people that cannot/or don’t want to use <a href="http://riseuplabs.org/privacy/apache/" title="libapache2-mod-removeip" rel="nofollow ugc">libapache2-mod-removeip</a> (because you don’t use 
apache or don’t want to wipe out the IP logging on all vhosts).

Remove IP

The plugin does exactly what its name suggests: it removes the IP address from new comments on your blog – not more and not less.

Simple and efficient

A simple plugin to not log IPs from comments.

Real IP and Geo for Cloudflare vs Remove IP