Limit WP-Admin to Certain IPs
All you need to do is access your .htaccess file, go to the very bottom and add this code:
ErrorDocument 401 /path-to-your-site/index.php?error=404
ErrorDocument 403 /path-to-your-site/index.php?error=404
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteCond %{REQUEST_URI} ^(.*)?wp-login\.php(.*)$ [OR]
RewriteCond %{REQUEST_URI} ^(.*)?wp-admin$
RewriteCond %{REMOTE_ADDR} !^IP Address One$
RewriteCond %{REMOTE_ADDR} !^IP Address Two$
RewriteCond %{REMOTE_ADDR} !^IP Address Three$
RewriteRule ^(.*)$ - [R=403,L]
</IfModule> Done and done.