For example my site: www.example.com

When anyone visits my site, I want them all to redirect to www.example.com/blog

But when I open my site it should not redirect me to blog, it should work normally. So how can I achieve the above using .htaccess?

I am going to apply the following code to redirect all pages to blog:

RewriteEngine on
RewriteCond %{HTTP_HOST} old\www.example.com$
RewriteRule .* http://www.example.com/blog? [L,R=301]

But how can I specify my IP address in above so I can access all pages and no redirects.