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.

Ipstenu (Mika Epstein)

JohnnyWhite2007

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.
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.
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<h3>Privacy Notes</h3>
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.
No external data is transmitted, it all stays on your install.

Register IPs

Does exactly waht it says

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

Real IP and Geo for Cloudflare vs Register IPs