This is C# implementation of RARP (Inverse ARP, actually). It uses only CLR 2.0 features, so it should work on almost every recent Windows OS (starting from Windows XP, since it uses iphlpapi.dll). It's a console application taking as input MAC address to resolve and outputting corresponding IP address if resolve successed and nothing otherwise. It is single-threaded, so resolving may take a while.
WARNING! The code hasn't been tested in modern Windows versions (starting Windows 8).
This project was developed for finding my toy robo-car since it's IP was constantly changing in local Wi-Fi network and it's MAC was steel stable (obviously).