Get real IP address behind cloudflare NGINX
Pre requisites
You may need to install the Real IP Module ⧉ if this is on bare metal
If you are using containerised Nginx, then it comes pre-installed
Create cloudflare IP file
Under your nginx
directory, create a file called cloudflare.conf
Edit the cloudflare file
In the window that opened, paste in the below:
Freshness of the Ranges
Check the # File last updated on:
comment in the below file. This site is built daily and this file is refreshed using the cloudflare API on https://api.cloudflare.com/client/v4/ips ⧉
# File last updated on: 2025-10-02 04:33:20 UTC
# Source: https://documentation.breadnet.co.uk/kb/nginx/get-real-ip-address-behind-cloudflare-nginx
real_ip_recursive on;
real_ip_header CF-Connecting-IP;
# IPv4 Ranges
set_real_ip_from 173.245.48.0/20;
set_real_ip_from 103.21.244.0/22;
set_real_ip_from 103.22.200.0/22;
set_real_ip_from 103.31.4.0/22;
set_real_ip_from 141.101.64.0/18;
set_real_ip_from 108.162.192.0/18;
set_real_ip_from 190.93.240.0/20;
set_real_ip_from 188.114.96.0/20;
set_real_ip_from 197.234.240.0/22;
set_real_ip_from 198.41.128.0/17;
set_real_ip_from 162.158.0.0/15;
set_real_ip_from 104.16.0.0/13;
set_real_ip_from 104.24.0.0/14;
set_real_ip_from 172.64.0.0/13;
set_real_ip_from 131.0.72.0/22;
# IPv6 Ranges
set_real_ip_from 2400:cb00::/32;
set_real_ip_from 2606:4700::/32;
set_real_ip_from 2803:f800::/32;
set_real_ip_from 2405:b500::/32;
set_real_ip_from 2405:8100::/32;
set_real_ip_from 2a06:98c0::/29;
set_real_ip_from 2c0f:f248::/32;
This tells nginx that any time it sees one of these IP ranges, it should look at the header CF-Connecting-IP
that gets sent
and then use that as the connecting IP
Setting NGINX to use this
For argument’s sake, we will make the below assumptions
- Location of the config file:
/etc/nginx/cloudflare.conf
- Location of the nginx config we want to fix:
/etc/nginx/bookstack.conf
We need to edit the config of a site we want to resolve the IP issue to
Add the include
statement in and point it to the full path of the file
server {
listen 80;
listen [::]:80;
root /var/www/documentation;
index index.html;
+ include /etc/nginx/cloudflare.conf;
}
Check the config is valid
you should see the below
Restart nginx
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