using System;
using System.Collections.Generic;
using System.Text;
using System.Net;//为了IPEndPoint而添加的引用
using System.Net.Sockets;

namespace GetClntIP
{
    class Program
    {
        static void Main(string[] args)
        {
            TcpListener tcpListener = new TcpListener(9000);//监听的端口号，可根据需要修改
            tcpListener.Start();

            //loop for listen
            while (true)
            {
                Socket sock = tcpListener.AcceptSocket();

                //服务器当前时间
                DateTime connTime = DateTime.Now;
                Console.WriteLine("The time is :"+connTime.ToString());

                System.Net.IPAddress ipAdd;
                int port;

                //获得连接当前用户的IP以及端口号
                ipAdd = (sock.RemoteEndPoint as IPEndPoint).Address;
                port = (sock.RemoteEndPoint as IPEndPoint).Port;

                Console.WriteLine("The client IP :"+ipAdd.ToString ());
                Console.WriteLine("The client port :" + port.ToString());
            }

            tcpListener.Stop();
        }
    }
}

[附]获取本地IP：

//获得本地局域网IP地址

IPAddress [] AddressList=Dns.GetHostByName(Dns.GetHostName()).AddressList;

if(AddressList.Length<1)

{

       retern "";

}

retern AddressList[0].ToString();//注意这里数组参数为0

//获得拨号动态分配IP地址

IPAdress [] AddressList=Dns.GetHostByName(Dns.GetHostName()).AddressList;

if(AddressList.Length<2)

{

        return "";

}

return AddressList[1].ToString();//注意这里数组参数为1