nmap -sP 192.168.1.0/24

List alive hosts in specific subnet

Works on any machine with nmap installed. Previous version does not work on machines without "seq". Also works on subnets of any size.
Sample Output
Nmap scan report for thunderbolt.example.com (192.168.1.1)
Host is up (0.0020s latency).
Nmap scan report for vyatta.example.com (192.168.1.2)
Host is up (0.0019s latency).
Nmap scan report for sdadh01.example.com (192.168.1.51)
Host is up (0.0075s latency).
Nmap scan report for cua01.example.com (192.168.1.61)
Host is up (0.0013s latency).
Nmap done: 256 IP addresses (4 hosts up) scanned in 0.02 seconds

21
By: sdadh01
2010-06-05 14:48:37

2 Alternatives + Submit Alt

What Others Think

The nmap command above will work, but can go a lot faster if you don't have to do DNS lookups for each of the IP's. Ex.: nmap -sP -n 192.168.1.0/24 On my network, the original command takes 14.176 seconds, while the second takes 3.812.
jaymcjay · 411 weeks and 3 days ago
you won't find nmap on every Linux system. Forget it when you're on an older UNIX system. Yall' shouldn't diss the 'for loop' version just for being 'too long'. It sometimes come in handy.
unefunge · 391 weeks and 2 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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