Find open IP in IP Range
Posted on 2009-05-14
Where I work we add new computers to the domain and for a unique computer name we use the last octet of the IP as the last three digits in the computer name. We have different IP ranges for each department. Unfortunately, not much documentation is kept so there is no way of telling which IP is open in any particular range. The lack of documentation makes it extremely difficult to say the least. I'm trying to document the Computer names and IP addresses of the IP ranges I administer so there won't be any IP or AD conflicts. It's busting my rear end but it will save me headaches in the future. I had a former coworker (who I have lost contact) show me how to scan a range of IPs on the network from the CMD line to see which are being used. Using that and looking at my OU in AD I can deduce what IP is open that I can use for a new system I want to put on the network. I had written down the command but I cannot find it. I tore apart my desk at work and home and googled for hours but still have not found anything. If someone can help me out I would really appreciate anything, please. Thanks.
Please keep in mind I cannot use any type of port scanner or third party program on my network.
I really think it was one of these:
Thanks for any assistance you can provide.