I created a script to have apache redirect viewers to a maintenance page, but still allow me to view the site normally using an IP address exception. The problem is, after doing a quick test, the script doesn't redirect to the maintenance page at all. It worked on the previous servers I've used it on.

<IfModule mod_rewrite.c>
RewriteEngine on
RewriteCond %{REMOTE_ADDR} !^255\.255\.255\.255$ #IPv4
RewriteCond %{REMOTE_ADDR} 0000:0000:0000:0000:0000:0000:0000:0000 #IPv6
RewriteCond %{REQUEST_URI} !/maintenance.html$ [NC]
RewriteCond %{REQUEST_URI} !\.(jpe?g?|png|gif|svg|css|js) [NC]
RewriteRule .* /maintenance.html [R=302,L]
</IfModule>