By default, when you want to block or allow some IP(s) from your website, you may simply do it as the following rules from .htaccess,
order deny,allow deny from all allow from 220.127.116.11 allow from 18.104.22.168
However, if you are using service like CloudFlare or other CDN service, you can not do like this as Apache do not understand your visitor IP.
To do that, you need to do like rules below,
SetEnvIf X-FORWARDED-FOR 22.214.171.124 allow SetEnvIf X-FORWARDED-FOR 126.96.36.199 allow order deny,allow deny from all allow from env=allow
If you need it for IP ranges or network block such as 188.8.131.52/24, you may do it like,
SetEnvIf X-FORWARDED-FOR "^1\.1\.1\.*" allow order deny,allow deny from all allow from env=allow