Getting IP Addy from MAC address

[The Linux Kid]

Hi everyone,

Is there anyway that I can get the IP address of a computer by typing in a MAC address? My school really wants to know how. I told them to use their DHCP server, but they told me that they are using static IP's. How stupid. Anyway, any help is appreciated.

Also I have access to Mac OS9, OSX, Linux and doze boxes to install this on.

Thanks in advance,

The Linux Kid

[ph34r]

In Windows, nbtstat -A ip.add.re.ss will show the netbios name, and the last line of output is the MAC address... so maybe a script that will cycle thru all your IPs and run the nbtstat program and collect the output would work. That will give you a list of MAC addys and the IPs for them.

[EnigmaOne]

I was thinking along the same lines on a Linux machine.
Outside of checking the arp cache, which will leave holes; script a sequence of pings; or just run nmap on the subnet, redirecting the output to a file.

Some windoze machines will hang or reboot on the nmap run, but it's not like anyone will notice anything unusual about that. ;)

[Gertrude]

http://www.habets.pp.se/synscan/programs.php?prog=arping

[heckle]

Are you using switches on the school network? If so, depending on the switch type, you can collect the information from the CAM/ARP table in the switch.