In this tutorial, we are going to find out IP addresses behind those websites that are associate with Cloudflare.

Before that, Cloudflare is basically an SSL, reverse proxy which makes a website more secure by adding a layer for the web layer. By using a Cloudflare, it is very hard to find the real hosting provider of the website, but do not worry, there are some resources that enable you to look for the actual IP.

These are the sample tools :
DNStrails, python.py Cloudflare, Shodan and Censys.

It is simple, for example, the tutorial for Censys, just search Censys website and type the domain based on Ipv4 address, and the web information will be shown.