Ja używam takiego wpisu w .htaccess:
Kod:
RewriteCond %{HTTP_USER_AGENT} ^$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*(192.comagent|1noonbot|4arcade|80legs).*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*(accoona|aipbot|aihitbot|aisearchbot|alkaline|allrati|amagit|analysis|analyticsseo|apexoo|appie|almaden|askpeter).*$ [NC,OR]
[...tu kolejne reguły wg. tego wzoru...]
RewriteCond %{HTTP_USER_AGENT} ^.*(yandex|yanga|yebolbot|yodao|yoogli|youdao).*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*(zedzo|zend_http_client|zeus).*$ [NC]
RewriteRule ^.*$ - [F]