Learn to Block A User Agent in An .htaccess File

You can prohibit visitors from multiple IP addresses using the same User Agent if there is a lot of traffic on your website. To accomplish this, modify your.htaccess file and add the following rules:

RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} UserAgentName [NC]
RewriteRule .* - [F,L]

Here replace UserAgentName with the actual name of the User Agent. For example, for blocking a User Agent named Textbot, you should add the below code:

RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} Textbot [NC]
RewriteRule .* - [F,L]

Add them at the start of the .htaccess file. For blocking more than one User Agent (e.g. named SCspider, Textbot and s2bot), add the below code:

RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} ^.*(SCspider|Textbot|s2bot).*$ [NC]
RewriteRule .* - [F,L]

For blocking the requests from machines with missing User Agent, add the below rules in your .htaccess file:

RewriteCond %{HTTP_USER_AGENT} ^-?$
RewriteRule ^ - [F]

In this way, you can clock a User Agent in an .htaccess file.

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