string strHostName = Dns.GetHostName(); //得到本机的主机名IPHostEntry ipEntry = Dns.GetHostByName(strHostName); //取得本机IPstring strAddr = ipEntry.AddressList[0].ToString(); //假设本地主机为单网卡在这段代码中使用了两个类,一个是Dns类,另一个为IPHostEntry类,二者都存在于命名空间System.Net中.Dns类主要是从域名系统(DNS)中检索关于特定主机的信息,上面的代码第一行就从本地的DNS中检索出本地主机名.IPHostEntry类则将一个域名系统或主机名与一组IP地址相关联,它与DNS类一起使用,用于获取主机的IP地址组.要获取远程主机的IP地址,其方法也是大同小异.在获取了IP地址后,如果还需要取得网卡的MAC地址,就需要进一步探究了.这里又分两种情况,一是本机MAC地址,二是远程主机MAC地址.二者的获取是完全不同的.在获取本机的MAC地址时,可以使用WMI规范,通过SELECT语句提取MAC地址.在.NET框架中,WMI规范的实现定义在System.Management命名空间中.ManagementObjectSearcher类用于根据指定的查询检索管理对象的集合ManagementObjectCollection类为管理对象的集合,下例中由检索对象返回管理对象集合赋值给它.示例:ManagementObjectSearcher query =new ManagementObjectSearcher("SELECT * FROM Win32_NetworkAdapterConfiguration") ;ManagementObjectCollection queryCollection = query.Get();foreach( ManagementObject mo in queryCollection ) { if(mo["IPEnabled"].ToString() == "True")mac = mo["MacAddress"].ToString();}获取远程主机的MAC地址时,需要借用API函数SendARP.该函数使用ARP协议,向目的主机发送ARP包,利用返回并存储在高速缓存中的IP和MAC地址对,从而获取远程主机的MAC地址.示例:Int32 ldest= inet_addr(remoteIP); //目的ip Int32 lhost= inet_addr(localIP); //本地ip try { Int64 macinfo = new Int64(); Int32 len = 6; int res = SendARP(ldest,0, ref macinfo, ref len); //发送ARP包return Convert.ToString(macinfo,16); } catch(Exception err) { Console.WriteLine("Error:{0}",err.Message); } return 0.ToString();但使用该方式获取MAC时有一个很大的限制,就是只能获取同网段的远程主机MAC地址.因为在标准网络协议下，ARP包是不能跨网段传输的，故想通过ARP协议是无法查询跨网段设备MAC地址的。示例程序:using System.Net;using System;using System.Management;using System.Runtime.InteropServices;public class getIP{[DllImport("Iphlpapi.dll")] private static extern int SendARP(Int32 dest,Int32 host,ref Int64 mac,ref Int32 length); [DllImport("Ws2_32.dll")] private static extern Int32 inet_addr(string ip); //获取本机的IPpublic string getLocalIP(){ string strHostName = Dns.GetHostName(); //得到本机的主机名 IPHostEntry ipEntry = Dns.GetHostByName(strHostName); //取得本机IP string strAddr = ipEntry.AddressList[0].ToString(); return(strAddr);}//获取本机的MACpublic string getLocalMac(){ string mac = null; ManagementObjectSearcher query =new ManagementObjectSearcher("SELECT * FROM Win32_NetworkAdapterConfiguration") ; ManagementObjectCollection queryCollection = query.Get(); foreach( ManagementObject mo in queryCollection ) { if(mo["IPEnabled"].ToString() == "True") mac = mo["MacAddress"].ToString(); } return(mac);}//获取远程主机IPpublic string[] getRemoteIP(string RemoteHostName){ IPHostEntry ipEntry = Dns.GetHostByName(RemoteHostName); IPAddress[] IpAddr = ipEntry.AddressList; string[] strAddr = new string[IpAddr.Length]; for (int i=0;i<IPADDR.LENGTH;I++) { strAddr[i] = IpAddr[i].ToString(); } return(strAddr);}//获取远程主机MACpublic string getRemoteMac(string localIP, string remoteIP) { Int32 ldest= inet_addr(remoteIP); //目的ip Int32 lhost= inet_addr(localIP); //本地ip try { Int64 macinfo = new Int64(); Int32 len = 6; int res = SendARP(ldest,0, ref macinfo, ref len); return Convert.ToString(macinfo,16); } catch(Exception err) { Console.WriteLine("Error:{0}",err.Message); } return 0.ToString();} public static void Main(string[] args){ getIP gi = new getIP(); Console.WriteLine("本地网卡信息:"); Console.WriteLine(gi.getLocalIP() + " - " + gi.getLocalMac()); Console.WriteLine("\n\r远程网卡信息:"); string[] temp = gi.getRemoteIP("scmobile-tj2"); for(int i=0;i<TEMP.LENGTH;I++) { Console.WriteLine(temp[i]); } Console.WriteLine(gi.getRemoteMac("192.168.0.3","192.168.0.1"));}}通过计算机名获取本网段内电脑的IP地址和MAC地址,布布扣,bubuko.com
原文：http://www.cnblogs.com/FLWL/p/3611465.html