find ip in a network

February 8, 2009 at 20:56:46
Specs: Windows Vista
how to find all used ip addresses in a network

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February 9, 2009 at 07:35:18
I have a script I wrote in UNIX that will go and ping all IP's in a certain subnet. If you have any UNIX/Linux experience, I'd be happy to share it with you.

Of course, this will only tell you which IP's are in use at that moment in time. There could still be IP's in that subnet that are used but on devices that aren't turned on at that moment in time.

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February 9, 2009 at 08:18:37
You would look at your ip documentation and your dhcp server.

No ip documentation you say? Well it looks like it is time to create one :-)

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February 9, 2009 at 13:43:13
You could also use a scanning tool like Angry IP Scanner ( that scans a given network for all IP addresses and ports.

Cisco 3750 Site

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February 9, 2009 at 14:23:31
You would only see the IP's that report.

"Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, are in my top 10

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February 9, 2009 at 17:17:10
The "used" IP addresses in a network will be the DHCP pool (if the network is running a DHCP server) + all the statically assigned IP addresses on the network. If you don't have that information available for your network, then unless it's a small network, you've got a mess on your hands.

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