Your public IP address is:

54.210.158.163

Block access to all IP's excluding your own

order deny,allow
deny from all
allow from 54.210.158.163

Temporary redirect all IP's excluding your own'

RewriteEngine On
RewriteBase /
RewriteCond %{REMOTE_HOST} !^54.210.158.163

RewriteRule .* http://www.google.com/ [R=302,L]