nmap -O www.ccc.de

Starting nmap 3.81 ( http://www.insecure.org/nmap/ ) at 2006-04-23 15:04 CEST
Interesting ports on www.ccc.de (213.73.91.29):
(The 1661 ports scanned but not shown below are in state: closed)
PORT    STATE SERVICE
80/tcp  open  http
443/tcp open  https
Device type: general purpose
Running: FreeBSD 5.X
OS details: FreeBSD 5.2-CURRENT (Jan 2004) on x86
Uptime 36.006 days (since Sat Mar 18 13:56:35 2006)

Nmap finished: 1 IP address (1 host up) scanned in 14.630 seconds