apache htaccess redirect based on subnet mask

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I need to redirect users coming from a certain subnets, ex: 99.99.0.0/20, 28.12.0.0/14, etc.. I've looked at several solutions, including the one below but, due to the diversity and number of ips, it's not doable.

RewriteEngine on
RewriteCond %{REMOTE_ADDR} ^99\.99\.0\.[0-9]$
RewriteCond %{REQUEST_URI} !^/index/
RewriteRule .? /index/ [R,L]

What do I need to add to the apache .htaccess file in order to achieve this ?

asked 40 secs ago

Pedro Lobito

6,450