[SOLVED] Redirect a range of IP addresses using RewriteCond

Redirect a range of IP addresses using RewriteCond

Currently, I am redirecting all users except for the IP address 12.345.678.90 using:

RewriteEngine On
RewriteCond %{REQUEST_URI} !/maintenance$
RewriteCond %{REMOTE_HOST} !^12\.345\.678\.90
RewriteRule $ /maintenance [R=302,L]

What syntax would I use to allow a range? In my Allow list I have:

Allow from 123.45.678.90/28

Would it work if I just update the REMOTE_HOST line to the following?

RewriteCond %{REMOTE_HOST} !^12\.345\.678\.90/28

Solution

You probably want the %{REMOTE_ADDR} to match against, but you can't use CIDR notation, as the %{REMOTE_ADDR} is literally the remote address, and you can use a regular expression to try to match against it. So for 123.45.67.89/28, (123.45.67.80 - 123.45.67.95), you'd have to do something like this:

RewriteCond %{REMOTE_ADDR} !^123\.45\.67\.8[0-9]$
RewriteCond %{REMOTE_ADDR} !^123\.45\.67\.9[0-5]$