Inacessible IP's

[Prognewb]

We have two static IP addresses that used to be assigned to 2 machines, but the machines were decomissioned and the IP's freed up for use at a later date.
The later date is here, but the IP's are showing up as in use (pinging the address shows this), and all of the machines on our network are accounted for and linked with different IP's. I'm not a network expert per se, so all I've thought to do is to flush the DNS cache, and that didn't fix it (not sure if it would or not, but it was worth a shot).
Two questions:
1. What could be some potential causes and/or solutions to this?
2. Is there some kind of software (preferably with a free trial) that I can use to map out our domain and show where every IP address lies?
Thanks in advance for any help.

 

[jimbopalmer]

Angry IP scanner may help.

http://www.angryziber.com/ipscan/

I would set it to show all columns but only for life hosts.

I tried to remain child-like, all I acheived was childish.

 

[AndrewTait]

Check that the IP addresses in question have not been assigned in any DHCP servers. Even if the old machines had static IP addreeses, all that would happen is that on the DHCP server, it would show up as in use.

Then when you switched off the old machines they became available to be issued by DHCP.

I would second the use of Angry IP Scanner and also NetworkView

http://www.networkview.com/

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You may think if it isn't broke, don't fix it. Engineers think that if it isn't broke, it doesn't have enough features yet!
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[Prognewb]

I found them... the people that came in to set up our time tracking system snagged them for our ethernet time clocks and never mentioned it. A little documentation goes a long way...