If you are a web designer or developer you might some times see some site and might want to know the technology behind it. But unfortunately there seems to be no way to find out because nowadays web technologies live no trace back to them on the front end, unlike before when every WordPress and Blogger blog will always have "Powered By WordPress" and "Powered By Blogger" at the bottom of the site.

In general, information like that is something people will want to hide, as the more information that is exposed the easier it might be for malicious parties to identify security vulnerabilities or denial of service holes. So, today every body tends to manipulate these web technologies and remove their traces or branding in the front end. And of course, most of the the times this can be a good obscure security measure.
Tools to Determine Technologies Used on website

Despite the fact that everybody is getting smart, there are still a lot of ways to determine what technology a website uses, though a lot of the times it doesn't really give you any certainty and accuracy. These are the two tools that I like using and I think are the best of all...

Read more: http://www.moreintel.com/Webmaster-Guides/how-to-find-out-technologies-and-frameworks-used-in-any-website.html