Ben bu şekilde engelliyorum, işe yarıyor.

.htaccess

Order Deny,Allow
Deny from 104.254.244.128
Deny from 162.253.144.140
Deny from 217.23.7.144
Deny from 64.13.232.232
Deny from 82.80.221.158
Deny from 192.64.147.216
Deny from 144.76.189.18