SS_PRO Don't know if it is reverse proxy. Take a look at https://support.cloudflare.com/hc/en-us/articles/200170786-How-do-I-restore-original-visitor-IP-with-Nginx-.
How to see the real visitor ip when using Cloudflare?
xhemj See my message above yours.
clarkwinkelmann it's "View post IP addresses" which is set to moderators by default
I don't know where can I find post IP addresses?