2.12.7. Restricting access by User-Agent

Directives must be placed in a file .htaccesslocated in the directory of the site to which you want to restrict access. Restricted visitors will receive answer 403.

Some User-Agents already blocked hosting by default.

RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} ^.*(useragent1|useragent2|useragent3).*$ [NC]
RewriteRule .* - [F,L]

Instead useragent1, useragent2 and useragent3 specify the User-Agent to block (you can specify it in any case).

RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} !^.*(useragent1|useragent2|useragent3).*$ [NC]
RewriteRule .* - [F,L]

Instead useragent1, useragent2 and useragent3 specify the User-Agent that should have access (you can specify it in any case).