Console test harness to get Physical Address to IP addresses (v4 & 6) mapping

program.cs

using System;
using System.Collections.Generic;
using System.Net.NetworkInformation;
using Newtonsoft.Json;

namespace ConsoleMacAddressTest
{
    class NetworkAddressMappings
    {
        public string PhysicalAddress
        {
            get;
            set;
        }
        public List<string> IPAddresses;
        
        public NetworkAddressMappings()
        {
            IPAddresses = new List<string>();
        }

        public static string GetAllMappings()
        {
            string macAddress = string.Empty;
            List<NetworkAddressMappings> lstMappings = new List<NetworkAddressMappings>();

            foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
            {
                if (nic.OperationalStatus == OperationalStatus.Up)
                {
                    macAddress = nic.GetPhysicalAddress().ToString();
                    if (macAddress != string.Empty)
                    {
                        NetworkAddressMappings am = new NetworkAddressMappings();
                        am.PhysicalAddress = macAddress;
                        List<string> addresses = new List<string>();
                        foreach (UnicastIPAddressInformation ip in nic.GetIPProperties().UnicastAddresses)
                            am.IPAddresses.Add(ip.Address.ToString());
                        
                        lstMappings.Add(am);
                    }
                }
            }
            return JsonConvert.SerializeObject(lstMappings, Formatting.Indented);
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(NetworkAddressMappings.GetAllMappings());
            NetworkChange.NetworkAddressChanged += new NetworkAddressChangedEventHandler(AddressChangedCallback);
            Console.ReadKey();
        }

        // this handles changes regardless DHCP or manual...
        static void AddressChangedCallback(object sender, EventArgs e)
        {
            Console.WriteLine(NetworkAddressMappings.GetAllMappings());
        }
    }
}