Automatic computer discovery by IP address range

My domain is a subdomain of a parent domain and I only manage devices in my own subnet with static IPs. I am just installing SCCM2102 r2 as a trial version! at step 1 to configure and devices to manage, I don't see an option to scan devices via an IP address
range! I don't want to scan entire root domain in which I don't manage. Is that option available somewhere in SCCM 2102 R2? thanks.
Thang Mo

There is also a network discovery that can be used to discover devices in a specific subnet. It's not very often used, as it cause lots of overhead and discovers also devices that you don't want to manage (see also:
http://technet.microsoft.com/en-us/library/hh427340.aspx#BKMK_ConfigNetworkDisc).
Also keep in mind that you don't need to discover the devices that you want to manage. It just makes it easier to install clients on them. Without discovering you would need to manually install the clietns.
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