Next Blog button

If you want to surf random blogs quickly, one way is to click on the "Next Blog" button on the top of a blog page hosted by Blogspot. I use it now and then to see what's new in the random blogosphere. Almost all of the blogs reached through the "Next Blog" button are Blogspot blogs, but there have been rare occasions when the URL of the blog doesn't end in blogspot.com. It makes me wonder, are they really hosted on Blogspot (or redirected from a Blogspot blog), and if not, how does the "Next Blog" button select blogs to navigate to?