Get LAN connected devices IP addresses - have MAC

Hi Folks
I have networked devices on a simple LAN (currently, for testing, this consists of when device connected directly to my PC's ethernet port).
I have the device's MAC address as it is printed on the outside of it.
I would like to be able to scan the network and get the IP address of it, and any other devices I would connect, as this would mean I dont need to assign static address to each item and then input that to the program.
All of the device's are of the same type.

Im working in vb.net but even just the concepts or classes I need to look at would be good to know (pretty noob at vb networking stuff)

Thanks