$ nmap -sP 192.168.10.*

Starting Nmap 4.03 ( http://www.insecure.org/nmap/ ) at 2006-12-15 14:02 CET
Host 192.168.10.0 appears to be up.
Host 192.168.10.1 appears to be up.
Host 192.168.10.3 appears to be up.
Host 192.168.10.5 appears to be up.
Host 192.168.10.8 appears to be up.
Host 192.168.10.9 appears to be up.
Host 192.168.10.11 appears to be up.
Host 192.168.10.13 appears to be up.
Host 192.168.10.97 appears to be up.
Host 192.168.10.105 appears to be up.
Host 192.168.10.113 appears to be up.
Host 192.168.10.121 appears to be up.
Host 192.168.10.192 appears to be up.
Host 192.168.10.193 appears to be up.
Host 192.168.10.195 appears to be up.
Host 192.168.10.200 appears to be up.
Host 192.168.10.201 appears to be up.
Host 192.168.10.203 appears to be up.
Host 192.168.10.208 appears to be up.
Host 192.168.10.209 appears to be up.
Nmap finished: 256 IP addresses (20 hosts up) scanned in 4.293 seconds