well i seem to get the hang of it now
C:\Documents and Settings\xxx\Desktop\nmap-3.81-win32\nmap-3.81>nmap
-O 10.0.0.10

Starting nmap 3.81 ( http://www.insecure.org/nmap ) at 2005-02-26 12:56 India St
andard Time
Note: Host seems down. If it is really up, but blocking our ping probes, try -P0

Nmap finished: 1 IP address (0 hosts up) scanned in 4.687 seconds

C:\Documents and Settings\xxx\Desktop\nmap-3.81-win32\nmap-3.81>nmap
-P0 -O 10.0.0.10

Starting nmap 3.81 ( http://www.insecure.org/nmap ) at 2005-02-26 12:56
Warning: OS detection will be MUCH less reliable because we did not find at lea
st 1 open and 1 closed TCP port
Insufficient responses for TCP sequencing (1), OS detection may be less accurate

Interesting ports on 10.0.0.10:
(The 1662 ports scanned but not shown below are in state: filtered)
PORT STATE SERVICE
21/tcp open ftp
Device type: general purpose|firewall
Running: Microsoft Windows NT/2K/XP, Symantec Windows NT/2K/XP
OS details: Microsoft Windows XP Pro RC1+ through final release, Microsoft Windo
ws XP Pro SP1, Microsoft Windows XP SP1, Symantec Enterprise Firewall 7.0 runnin
g on Windows 2000 SP2

Nmap finished: 1 IP address (1 host up) scanned in 28.531 seconds

C:\Documents and Settings\xxx\Desktop\nmap-3.81-win32\nmap-3.81>