nmap オンラインのホストを探す

% time nmap -sP 10.0.0.0/24

Starting Nmap 5.51 ( http://nmap.org ) at 2011-12-31 13:05 JST
Strange error from connect (64):Host is down
Nmap scan report for foo.bar (10.0.0.1)
Host is up (0.0022s latency).
Nmap scan report for 10.0.0.3
Host is up (0.0060s latency).
Nmap scan report for 10.0.0.4
Host is up (0.030s latency).
Nmap scan report for 10.0.0.6
Host is up (0.0012s latency).
Nmap scan report for 10.0.0.9
Host is up (0.014s latency).
Nmap scan report for 10.0.0.10
Host is up (0.14s latency).
Nmap scan report for bsd.foo.bar (10.0.0.51)
Host is up (0.00011s latency).
Nmap scan report for 10.0.0.52
Host is up (0.0014s latency).
Nmap scan report for 10.0.0.53
Host is up (0.057s latency).
Nmap done: 256 IP addresses (9 hosts up) scanned in 29.81 seconds

Time spent in user mode   (CPU seconds) : 0.002s
Time spent in kernel mode (CPU seconds) : 0.036s
Total time                              : 0:29.81s
CPU utilisation (percentage)            : 0.1%
Times the process was swapped           : 0
Times of major page faults              : 0
Times of minor page faults              : 426