.htaccess restrict site to certain IP addresses redirect others
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteCond %{REMOTE_ADDR} !^220.239.238.84
RewriteCond %{REMOTE_ADDR} !^220.239.238.83 /*add in your IP addresses and remove this comment*/
RewriteCond %{REQUEST_URI} !/maintenance.html$ [NC]
RewriteCond %{REQUEST_URI} !\.(jpe?g?|png|gif) [NC]
RewriteRule .* /maintenance.html [R=302,L]
</IfModule>