<PackageReference Include="NETStandard.Library" Version="2.0.2" />

System.Net.NetworkInformation.PhysicalAddress

public class PhysicalAddress
namespace System.Net.NetworkInformation { public class PhysicalAddress { public static readonly PhysicalAddress None; public PhysicalAddress(byte[] address); public byte[] GetAddressBytes(); public static PhysicalAddress Parse(string address); } }