C# NICのMACアドレスの取得方法

using System;
using System.Runtime.InteropServices;

namespace Sample
{
	class Class1
	{
		[STAThread]
		static void Main(string[] args)
		{
			UInt32 ipAddr = inet_addr("192.168.25.31");

			byte[] macAddr = new byte[6];
			int lenPhyAddr = 6;

			int hr = SendARP(ipAddr, 0, macAddr, ref lenPhyAddr);
			if (hr != 0) 
			{
				Console.WriteLine("MACアドレスの取得に失敗しました。");
			}
			else 
			{
				Console.WriteLine("MACアドレス：{0,2:X}:{1,2:X}:{2,2:X}:{3,2:X}:{4,2:X}:{5,2:X}",
					macAddr[0],macAddr[1],macAddr[2],macAddr[3],macAddr[4],macAddr[5]);
			}

		}

		[DllImport("ws2_32.dll", ExactSpelling=true)]
		static extern UInt32 inet_addr(string cp);


		[DllImport("iphlpapi.dll", ExactSpelling=true)]
		public static extern int SendARP(UInt32 DestIP, UInt32 SrcIP, [Out] byte[] pMacAddr, ref int PhyAddrLen);
	}
}