using System;

using System.Net;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        var endpoints = new IPEndPoint[]

        {

            new IPEndPoint(IPAddress.Parse("8.8.4.4"), 53),

            new IPEndPoint(IPAddress.Parse("2001:db8::ff00:42:8329"), 81)

        };

        var settings = new JsonSerializerSettings();

        settings.Converters.Add(new IPAddressConverter());

        settings.Converters.Add(new IPEndPointConverter());

        settings.Formatting = Formatting.Indented;

        string json = JsonConvert.SerializeObject(endpoints, settings);

        Console.WriteLine(json);

        var endpoints2 = JsonConvert.DeserializeObject<IPEndPoint[]>(json, settings);

        foreach (IPEndPoint ep in endpoints2)

        {

            Console.WriteLine();

            Console.WriteLine("AddressFamily: " + ep.AddressFamily);

            Console.WriteLine("Address: " + ep.Address);

            Console.WriteLine("Port: " + ep.Port);

        }

    }

}

​

class IPAddressConverter : JsonConverter

{

    public override bool CanConvert(Type objectType)

    {

        return (objectType == typeof(IPAddress));

    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)

    {

        writer.WriteValue(value.ToString());

    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)

    {

        return IPAddress.Parse((string)reader.Value);

    }

}

​

class IPEndPointConverter : JsonConverter

{

    public override bool CanConvert(Type objectType)

    {

        return (objectType == typeof(IPEndPoint));

    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)

    {

        IPEndPoint ep = (IPEndPoint)value;

        JObject jo = new JObject();

        jo.Add("Address", JToken.FromObject(ep.Address, serializer));

        jo.Add("Port", ep.Port);

        jo.WriteTo(writer);

    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)

    {

        JObject jo = JObject.Load(reader);

        IPAddress address = jo["Address"].ToObject<IPAddress>(serializer);

        int port = (int)jo["Port"];

        return new IPEndPoint(address, port);

    }

}

​