I need to get information about an ip address in a local network. My program searches for active addresses, and puts them in a list. Now, I need to be able to check to see what type of device they are, i.e. computer, printer, router, ect.

There are 10 types of people - Those who understand binary, and those who don't.

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There are 10 types of people - Those who understand binary, and those who don\'t.
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Ok, how is this a C#/C++ question is beyond me, but nevertheless,
there are protocols that can be used to determine device information.
 the devices need to support them though. you could write code to use multiple protocols for device discovery ( UPNP, SNMP, TCP/connect at known ports, etc) if nothing works then you could possibly "predict" the device from the MAC address( well ofcourse if the device's MAC address is not spoofed).