I have a personal blog - nothing to get exited about and nothing that would really be of interest to my employers, just family news and photos etc. Nevertheless, I don't particularly want colleagues to necessarily have access to viewing it.

At the moment I don't have internet access at work, though that may change as I have been given some extra responsibilities at work and over xmas I will be switching from taking incoming calls to doing admin work.

My web hoster supports PHP and I know how to add a script preventing a particular IP from viewing my page (the index page should be enough).

What I'm wondering is, if there is any way I can find out this company's IP address which I need to add such a script, without the option of finding out from email which at the moment I don't have?