Detecting computers on network

[gene tani]

Hi Sandeep,

i didn't see where you said if these hosts you want to ping are on your
internal network, or beyond your gateway.  Probably the only truly
reliable way to maintain an active hosts list is to install a
ping-sending client on them, like

http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/52302

And think about possible legal ramifications of port scanning hosts or
possibly getting your IP blacklisted by a host's firewall, before you
do it.