::fping::

fping

use fping to ping a set of IP ranges or simply to resolve the IP to hostname
Linux - fping (a program to hosts in parallel)
download: fping

Basic usage:
$ fping -s -g -d 72.20.25.185 72.20.25.190 -r 1

results:

security.org.au is alive
your.on.ugly-people.org is alive
put.your.pix.up.on.ugly-people.org is unreachable
Bush.can.save-teh.US is unreachable
is.here.to.save-teh.US is unreachable
highly.p0ision.us is unreachable

6 targets
2 alive
4 unreachable
0 unknown addresses

24 timeouts (waiting for response)
24 ICMP Echos sent
2 ICMP Echo Replies received
0 other ICMP received

0.00 ms (min round trip time)
0.00 ms (avg round trip time)
0.00 ms (max round trip time)
4.268 sec (elapsed real time)

for more usage refer to "man fping" or linuxscrew.com

one good tools for Windows with the same functions is Angry IP scanner
download: angryziber.com