[apache] htaccess "order" Deny, Allow, Deny

Change your code to

<Limit GET POST>
deny from all

allow from 139.82.0.0/16
allow from 143.54.0.0/16
allow from 186.192.0.0/11
allow from 186.224.0.0/11
</Limit>

This way your htaccess will deny every except those that you explicitly allow with allow from..

A proxy within the allow range can easily be overwritten with an additional deny from.. rule.