关于C#网络编程

[Tony_Xian]

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            IPHostEntry host = Dns.Resolve(txtUrl.Text);
            foreach (IPAddress add in host.AddressList)
            {
                long ip = add.Address;
                listBox1.Items.Add(add.ToString());     
                listBox1.Items.Add(ip.ToString());      
            }
            txtName.Text = host.HostName;
            txtBroad.Text = IPAddress.Broadcast.ToString();
        }
    }
}

请教一下大家，这个add和ip分别代表什么?add是183.232.237.173，而ip则是一连串的数字

[njit_77]

https://msdn.microsoft.com/zh-cn/library/system.net.ipaddress.aspx