If ever you are asked to do a testing proof of concept and you need to quickly identify a web server type you can use idserve from Gibson Research Corporation. This sends a simple HTTP request to a webserver and presents the HTTP response headers to the user. This allows you to identify the server type which can be useful when working out the best way to write scripts to test the site.
The latest version also identifies non-HTTP server types (e.g. FTP, SMTP, POP or NEWS) and does reverse DNS lookups so that it can identify a server’s name if all you know is the IP address.
This can be downloaded from Steve Gibson’s website, along with a whole load of other utilities.