--- title: How to use desired clean IPs based on the specified format (for the forced to use host field) --- # How to use desired clean IPs based on the specified format (for the forced to use host field) As you probably know, one of new features of HiddifyManager is AutoCDN which depends on the subdomains of Cloudflare's clean IPs collected by IRCF. To use it, you must use a suitable format. How to use this format? Also, what if you want to use your clean IP range for different operators? To do this, first go to [here](https://ip-format.hiddify.com/). Here you will enter the IRCF domain name format page. Choose the domains you want based on your needs and delete the domains you don't need.