I found this site Netcrafts that allows you to find out what website a webserver software uses. You can check it out at http://uptime.netcraft.com/up/graph

heres an example from elitehackers.com

OS, Web Server and Hosting History for www.elitehackers.com

OS, Web Server and Hosting History for elitehackers.com
OS Server Last changed IP address Netblock Owner
Linux Apache 20-Nov-2003 64.246.6.157 EV1Servers
unknown Apache 19-Nov-2003 64.246.6.157 EV1Servers
Linux Apache 5-Sep-2003 64.246.6.157 EV1Servers
Linux Apache/1.3.27 (Unix) (Red-Hat/Linux) mod_jk/1.2.0 mod_perl/1.26 PHP/4.2.2 FrontPage/5.0.2 mod_ssl/2.8.12 OpenSSL/0.9.6b 28-Jul-2003 64.246.6.157 EV1Servers
Linux Apache 8-Jan-2003 64.246.6.157 EV1Servers
Linux Apache/1.3.27 (Unix) (Red-Hat/Linux) mod_perl/1.24_01 PHP/4.2.2 FrontPage/5.0.2 mod_ssl/2.8.12 OpenSSL/0.9.6b 26-Dec-2002 64.246.6.157 EV1Servers
Linux Apache/1.3.27 (Unix) (Red-Hat/Linux) mod_jk/1.2.0 mod_perl/1.24_01 PHP/4.2.2 FrontPage/5.0.2 mod_ssl/2.8.12 OpenSSL/0.9.6b 20-Dec-2002 64.246.6.157 EV1Servers
Linux Apache 30-Oct-2002 64.246.6.157 EV1Servers
Linux unknown 29-Oct-2002 64.246.6.157 EV1Servers
Linux Apache 29-Sep-2002 64.246.6.157 EV1Servers

This site is really helpful. Its always nice to see what different companys are running curosity of course. No need for 3rd party sofware aswell. Computernerd22