title: Can I use the same Google Analytics tag for a blog subdomain of my site as the main site?
body: <p>I have my site.com and blog.mysite.com on a different IP address.  Can I use the same Google analytics ID for both sites?  Does Google analytics look at what IP address the recorded visitor information is from?  If it doesn't, what prevents random sites from including your Google analytics tag and sending random data to your account?</p>