blocks|key|891601|text|您可以对地址范围执行ping操作，并注意主机是否响应。当然，这需要主机响应ping数据包。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|891602|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You could ping the adress range and note if a host responded. Of course, this will require the host to respond to the ping packets.

blocks|key|1106611|text|您需要构建一个地址范围(例如192.168.0.1+-+192.168.255.254)并对每个地址执行ping操作。如果收到响应，则该主机处于活动状态。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1106612|异步Ping教程：|1106613|http://www.geekpedia.com/tutorial234_Asynchronous-Ping-using-Csharp.html|offset|length|1106614|但是，一些较新的操作系统会阻止ping请求(ICMP)。需要在每台计算机的防火墙中禁用此功能，您才能收到响应。|1106615|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|20|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|S|8|@]|9|@$F|T|G|U|1|V]]|A|$]]|$1|H|3|I|5|6|7|W|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|E]]]]

You would need to build an address range (e.g. 192.168.0.1 - 192.168.255.254) and ping each of those addresses. If a response is received, then that host is active.

Asynchronous Ping Tutorial:

<a href="http://www.geekpedia.com/tutorial234_Asynchronous-Ping-using-Csharp.html" rel="nofollow">http://www.geekpedia.com/tutorial234_Asynchronous-Ping-using-Csharp.html</a>

However, some newer operating systems block ping requests (ICMP). This would need to be disabled in the firewall on each computer for you to receive a response.

blocks|key|1106674|text|你得做个ping扫描。在System.Net名称空间中有一个Ping类。示例如下。此外，只有当您的计算机没有运行防火墙时，这才是可能的。如果他们启用了防火墙，那么除了在您的交换机上执行SNMP查询之外，无法确定此信息。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1106675|System.Net.NetworkInformation.Ping+p+=+new+System.Net.NetworkInformation.Ping();
System.Net.NetworkInformation.PingReply+rep+=+p.Send("192.168.1.1");
if+(rep.Status+==+System.Net.NetworkInformation.IPStatus.Success)
{
++++//host+is+active
}|code-block|syntax|javascript|1106676|另一个问题是确定你的网络有多大。在大多数家庭情况下，您的网络掩码将是24位。这意味着它被设置为255.255.255.0。如果您的网关是192.168.1.1，这意味着您网络上的有效地址将是192.168.1.1到192.168.1.254。这里有一个IP+Calculator可以提供帮助。您必须遍历每个地址，并使用ping类对地址执行Ping操作，然后检查PingReply。|offset|length|1106677|如果你只是在寻找信息，而不关心如何获得它，你可以使用NMap。该命令将如下所示|1106678|nmap+-sP+192.168.1.0/24|1106679|编辑：|1106680|就速度而言，由于您是在本地网络上，您可以大大缩短超时间隔，因为您的机器响应时间不应超过100毫秒。您还可以使用SendAsync并行地对它们执行ping操作。下面的程序将在半秒内ping+254地址。|1106681|using+System;
using+System.Collections.Generic;
using+System.Linq;
using+System.Text;
using+System.Net.NetworkInformation;
using+System.Diagnostics;
using+System.Net;
using+System.Threading;
using+System.Net.Sockets;

namespace+ConsoleApplication1
{
++++class+Program
++++{
++++++++static+CountdownEvent+countdown;
++++++++static+int+upCount+=+0;
++++++++static+object+lockObj+=+new+object();
++++++++const+bool+resolveNames+=+true;

++++++++static+void+Main(string[]+args)
++++++++{
++++++++++++countdown+=+new+CountdownEvent(1);
++++++++++++Stopwatch+sw+=+new+Stopwatch();
++++++++++++sw.Start();
++++++++++++string+ipBase+=+"10.22.4.";
++++++++++++for+(int+i+=+1;+i+<+255;+i%2B%2B)
++++++++++++{
++++++++++++++++string+ip+=+ipBase+%2B+i.ToString();

++++++++++++++++Ping+p+=+new+Ping();
++++++++++++++++p.PingCompleted+%2B=+new+PingCompletedEventHandler(p_PingCompleted);
++++++++++++++++countdown.AddCount();
++++++++++++++++p.SendAsync(ip,+100,+ip);
++++++++++++}
++++++++++++countdown.Signal();
++++++++++++countdown.Wait();
++++++++++++sw.Stop();
++++++++++++TimeSpan+span+=+new+TimeSpan(sw.ElapsedTicks);
++++++++++++Console.WriteLine("Took+{0}+milliseconds.+{1}+hosts+active.",+sw.ElapsedMilliseconds,+upCount);
++++++++++++Console.ReadLine();
++++++++}

++++++++static+void+p_PingCompleted(object+sender,+PingCompletedEventArgs+e)
++++++++{
++++++++++++string+ip+=+(string)e.UserState;
++++++++++++if+(e.Reply+!=+null+&&+e.Reply.Status+==+IPStatus.Success)
++++++++++++{
++++++++++++++++if+(resolveNames)
++++++++++++++++{
++++++++++++++++++++string+name;
++++++++++++++++++++try
++++++++++++++++++++{
++++++++++++++++++++++++IPHostEntry+hostEntry+=+Dns.GetHostEntry(ip);
++++++++++++++++++++++++name+=+hostEntry.HostName;
++++++++++++++++++++}
++++++++++++++++++++catch+(SocketException+ex)
++++++++++++++++++++{
++++++++++++++++++++++++name+=+"?";
++++++++++++++++++++}
++++++++++++++++++++Console.WriteLine("{0}+({1})+is+up:+({2}+ms)",+ip,+name,+e.Reply.RoundtripTime);
++++++++++++++++}
++++++++++++++++else
++++++++++++++++{
++++++++++++++++++++Console.WriteLine("{0}+is+up:+({1}+ms)",+ip,+e.Reply.RoundtripTime);
++++++++++++++++}
++++++++++++++++lock(lockObj)
++++++++++++++++{
++++++++++++++++++++upCount%2B%2B;
++++++++++++++++}
++++++++++++}
++++++++++++else+if+(e.Reply+==+null)
++++++++++++{
++++++++++++++++Console.WriteLine("Pinging+{0}+failed.+(Null+Reply+object?)",+ip);
++++++++++++}
++++++++++++countdown.Signal();
++++++++}
++++}
}|1106682|编辑:在我自己使用它之后，我修改了程序，输出了有多少个IP响应。有一个const布尔值，如果设置为true，将导致程序解析IP的主机名。不过，这会显著减慢扫描速度。(不到半秒到16秒)还发现，如果IP地址指定不正确(我自己也犯了一个打字错误)，回复对象可能为空，所以我对此进行了处理。|style|CODE|1106683|entityMap|0|LINK|mutability|MUTABLE|url|http://jodies.de/ipcalc^0|0|0|3I|D|0|0|0|0|0|0|0|Z|5|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|18|8|@]|9|@$I|19|J|1A|1|1B]]|A|$]]|$1|K|3|L|5|6|7|1C|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|1D|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|1E|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1F|8|@]|9|@]|A|$]]|$1|S|3|T|5|D|7|1G|8|@]|9|@]|A|$E|F]]|$1|U|3|V|5|6|7|1H|8|@$I|1I|J|1J|W|X]]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]]|Z|$10|$5|11|12|13|A|$14|15]]]]

You'll have to do a ping sweep. There's a Ping class in the System.Net namespace. Example follows. Also this is only possible if your computers don't have firewalls running. If they've got a firewall enabled, there's no way to determine this information short of doing SNMP queries on your switches.

<pre><code>System.Net.NetworkInformation.Ping p = new System.Net.NetworkInformation.Ping();
System.Net.NetworkInformation.PingReply rep = p.Send("192.168.1.1");
if (rep.Status == System.Net.NetworkInformation.IPStatus.Success)
{
 //host is active
}
</code></pre>

The other issue is to determine how large your network is. In most home situations, your network mask will be 24 bits. This means that its set to 255.255.255.0. If your gateway is 192.168.1.1, this means that valid addresses on your network will be 192.168.1.1 to 192.168.1.254. Here's an <a href="http://jodies.de/ipcalc" rel="noreferrer">IP Calculator</a> to help. You'll have to loop through each address and ping the address using the Ping class and check the PingReply. 

If you're just looking for the information and aren't concerned with how you get it, you can use NMap. The command would be as follows

<pre><code>nmap -sP 192.168.1.0/24
</code></pre>

EDIT:

As far as speed goes, since you're on a local network, you can cut down the timeout interval considerably as your machines shouldn't take more than 100 milliseconds to reply. You can also use SendAsync to ping them all in parallel. The following program will ping 254 address in under half a second.

<pre><code>using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.NetworkInformation;
using System.Diagnostics;
using System.Net;
using System.Threading;
using System.Net.Sockets;

namespace ConsoleApplication1
{
 class Program
 {
 static CountdownEvent countdown;
 static int upCount = 0;
 static object lockObj = new object();
 const bool resolveNames = true;

 static void Main(string[] args)
 {
 countdown = new CountdownEvent(1);
 Stopwatch sw = new Stopwatch();
 sw.Start();
 string ipBase = "10.22.4.";
 for (int i = 1; i &lt; 255; i++)
 {
 string ip = ipBase + i.ToString();

 Ping p = new Ping();
 p.PingCompleted += new PingCompletedEventHandler(p_PingCompleted);
 countdown.AddCount();
 p.SendAsync(ip, 100, ip);
 }
 countdown.Signal();
 countdown.Wait();
 sw.Stop();
 TimeSpan span = new TimeSpan(sw.ElapsedTicks);
 Console.WriteLine("Took {0} milliseconds. {1} hosts active.", sw.ElapsedMilliseconds, upCount);
 Console.ReadLine();
 }

 static void p_PingCompleted(object sender, PingCompletedEventArgs e)
 {
 string ip = (string)e.UserState;
 if (e.Reply != null &amp;&amp; e.Reply.Status == IPStatus.Success)
 {
 if (resolveNames)
 {
 string name;
 try
 {
 IPHostEntry hostEntry = Dns.GetHostEntry(ip);
 name = hostEntry.HostName;
 }
 catch (SocketException ex)
 {
 name = "?";
 }
 Console.WriteLine("{0} ({1}) is up: ({2} ms)", ip, name, e.Reply.RoundtripTime);
 }
 else
 {
 Console.WriteLine("{0} is up: ({1} ms)", ip, e.Reply.RoundtripTime);
 }
 lock(lockObj)
 {
 upCount++;
 }
 }
 else if (e.Reply == null)
 {
 Console.WriteLine("Pinging {0} failed. (Null Reply object?)", ip);
 }
 countdown.Signal();
 }
 }
}
</code></pre>

EDIT: After some use of it myself, I modified the program to output a count of how many IPs responded. There's a <code>const</code> bool that if set to true, will cause the program resolve the host names of the IPs. This significantly slows down the scan, though. (under half a second to 16 seconds) Also found that if the IP address is incorrectly specified (made a typo myself), the reply object can be null, so I handled that.

blocks|key|1106721|text|而不是安排一个疯狂的ping-party，你可以(我真的不知道确切地说！)使用NetBIOS+(以某种方式请求netbios+nametable？)+http://technet.microsoft.com/en-us/library/cc757216%2528WS.10%2529.aspx。或者为什么不询问您的DHCP服务器？|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1106722|entityMap|0|LINK|mutability|MUTABLE|url|http://technet.microsoft.com/en-us/library/cc757216%2528WS.10%2529.aspx^0|23|1V|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Instead of arranging a wild ping-party, you could possibly (I really don't know exactly!) use NetBIOS (request the netbios nametable somehow?) <a href="http://technet.microsoft.com/en-us/library/cc757216%28WS.10%29.aspx" rel="nofollow">http://technet.microsoft.com/en-us/library/cc757216%28WS.10%29.aspx</a>. Or why not ask your DHCP server?

blocks|key|891838|text|Ping全局广播ip地址(192.168.1.255)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|891839|正常情况下，我们将从连接到LAN的所有主机获得回复。或者，如果您具有lan的任何特定网络，则ping该网络的广播id+(即，该范围中的最后一个ip地址)。|891840|然后，您可以知道所有的ip地址连接到局域网中的主机。|891841|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Ping to the global broadcast ip address (192.168.1.255)

Normally we will get the reply from all the host connected to the LAN.. Or if you have any particular network for the lan, ping to that networks broadcast id (i.e the last ip address in that range ).

Then you can know all the ip address connected to the host in lan.

blocks|key|891889|text|您可以在托管代码中完成所有这些工作。我使用System.DirectoryServices和System.Net来实现。基本上，我从DirectoryServices获取本地计算机的名称(处理域和工作组)，然后从System.Net.Dns获取每个主机的IP地址。下面是打包到一个方便的类中的所有内容。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|891890|public+class+NetworkComputer+{
++++private+string+_domain;
++++private+string+_name;
++++private+IPAddress[]+_addresses+=+null;

++++public+string+Domain+{+get+{+return+_domain;+}+}
++++public+string+Name+{+get+{+return+_name;+}+}
++++public+IPAddress[]+Addresses+{+get+{+return+_addresses;+}+}

++++private+NetworkComputer(string+domain,+string+name)+{
++++++++_domain+=+domain;
++++++++_name+=+name;
++++++++try+{+_addresses+=+Dns.GetHostAddresses(name);+}+catch+{+}
++++}

++++public+static+NetworkComputer[]+GetLocalNetwork()+{
++++++++var+list+=+new+List<NetworkComputer>();
++++++++using(var+root+=+new+DirectoryEntry("WinNT:"))+{
++++++++++++foreach(var+_+in+root.Children.OfType<DirectoryEntry>())+{
++++++++++++++++switch(_.SchemaClassName)+{
++++++++++++++++++++case+"Computer":
++++++++++++++++++++++++list.Add(new+NetworkComputer("",+_.Name));
++++++++++++++++++++++++break;
++++++++++++++++++++case+"Domain":
++++++++++++++++++++++++list.AddRange(_.Children.OfType<DirectoryEntry>().Where(__+=>+(__.SchemaClassName+==+"Computer")).Select(__+=>+new+NetworkComputer(_.Name,+__.Name)));
++++++++++++++++++++++++break;
++++++++++++++++}
++++++++++++}
++++++++}
++++++++return+list.OrderBy(_+=>+_.Domain).ThenBy(_+=>+_.Name).ToArray();
++++}
}|code-block|syntax|javascript|891891|然后只需调用静态方法来获取LAN计算机的数组...|891892|var+localComputers+=+NetworkComputer.GetLocalNetwork();|891893|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You can do it all in managed code. I do it using System.DirectoryServices and System.Net. Basically I get the names of the local computers from DirectoryServices (handling domains and workgroups as I go) then get each host's IP addresses from System.Net.Dns. Here's everything packed into a handy class...

<pre><code>public class NetworkComputer {
 private string _domain;
 private string _name;
 private IPAddress[] _addresses = null;

 public string Domain { get { return _domain; } }
 public string Name { get { return _name; } }
 public IPAddress[] Addresses { get { return _addresses; } }

 private NetworkComputer(string domain, string name) {
 _domain = domain;
 _name = name;
 try { _addresses = Dns.GetHostAddresses(name); } catch { }
 }

 public static NetworkComputer[] GetLocalNetwork() {
 var list = new List&lt;NetworkComputer&gt;();
 using(var root = new DirectoryEntry("WinNT:")) {
 foreach(var _ in root.Children.OfType&lt;DirectoryEntry&gt;()) {
 switch(_.SchemaClassName) {
 case "Computer":
 list.Add(new NetworkComputer("", _.Name));
 break;
 case "Domain":
 list.AddRange(_.Children.OfType&lt;DirectoryEntry&gt;().Where(__ =&gt; (__.SchemaClassName == "Computer")).Select(__ =&gt; new NetworkComputer(_.Name, __.Name)));
 break;
 }
 }
 }
 return list.OrderBy(_ =&gt; _.Domain).ThenBy(_ =&gt; _.Name).ToArray();
 }
}
</code></pre>

Then just call the static method to get an array of your LAN computers...

<pre><code>var localComputers = NetworkComputer.GetLocalNetwork();
</code></pre>

blocks|key|1106811|text|namespace+WindowsFormsApplication1
{
++++class+WifiInformation
++++{
++++++++static+CountdownEvent+countdown;
++++++++static+int+upCount+=+0;
++++++++static+object+lockObj+=+new+object();
++++++++const+bool+resolveNames+=+true;

++++++++static+void+Main(string[]+args)
++++++++{
++++++++++++string+ipBase+=+getIPAddress();
++++++++++++string[]+ipParts+=+ipBase.Split('.');
++++++++++++ipBase+=+ipParts[0]+%2B+"."+%2B+ipParts[1]+%2B+"."+%2B+ipParts[2]+%2B+".";
++++++++++++for+(int+i+=+1;+i+<+255;+i%2B%2B)
++++++++++++{
++++++++++++++++string+ip+=+ipBase+%2B+i.ToString();

++++++++++++++++Ping+p+=+new+Ping();
++++++++++++++++p.PingCompleted+%2B=+new+PingCompletedEventHandler(p_PingCompleted);
++++++++++++++++p.SendAsync(ip,+100,+ip);
++++++++++++}
++++++++++++Console.ReadLine();
++++++++}

++++++++static+void+p_PingCompleted(object+sender,+PingCompletedEventArgs+e)
++++++++{
++++++++++++string+ip+=+(string)e.UserState;
++++++++++++if+(e.Reply+!=+null+&&+e.Reply.Status+==+IPStatus.Success)
++++++++++++{
++++++++++++++++if+(resolveNames)
++++++++++++++++{
++++++++++++++++++++string+name;
++++++++++++++++++++try
++++++++++++++++++++{
++++++++++++++++++++++++IPHostEntry+hostEntry+=+Dns.GetHostEntry(ip);
++++++++++++++++++++++++name+=+hostEntry.HostName;
++++++++++++++++++++}
++++++++++++++++++++catch+(SocketException+ex)
++++++++++++++++++++{
++++++++++++++++++++++++name+=+"?";
++++++++++++++++++++}
++++++++++++++++++++Console.WriteLine("{0}+({1})+is+up:+({2}+ms)",+ip,+name,+e.Reply.RoundtripTime);
++++++++++++++++}
++++++++++++++++else
++++++++++++++++{
++++++++++++++++++++Console.WriteLine("{0}+is+up:+({1}+ms)",+ip,+e.Reply.RoundtripTime);
++++++++++++++++}
++++++++++++++++lock+(lockObj)
++++++++++++++++{
++++++++++++++++++++upCount%2B%2B;
++++++++++++++++}
++++++++++++}
++++++++++++else+if+(e.Reply+==+null)
++++++++++++{
++++++++++++++++Console.WriteLine("Pinging+{0}+failed.+(Null+Reply+object?)",+ip);
++++++++++++}
++++++++}

++++++++public+static+string+getIPAddress()
++++++++{
++++++++++++IPHostEntry+host;
++++++++++++string+localIP+=+"";
++++++++++++host+=+Dns.GetHostEntry(Dns.GetHostName());
++++++++++++foreach+(IPAddress+ip+in+host.AddressList)
++++++++++++{
++++++++++++++++if+(ip.AddressFamily+==+AddressFamily.InterNetwork)
++++++++++++++++{
++++++++++++++++++++localIP+=+ip.ToString();
++++++++++++++++}
++++++++++++}
++++++++++++return+localIP;
++++++++}
++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1106812|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>namespace WindowsFormsApplication1
{
 class WifiInformation
 {
 static CountdownEvent countdown;
 static int upCount = 0;
 static object lockObj = new object();
 const bool resolveNames = true;

 static void Main(string[] args)
 {
 string ipBase = getIPAddress();
 string[] ipParts = ipBase.Split('.');
 ipBase = ipParts[0] + "." + ipParts[1] + "." + ipParts[2] + ".";
 for (int i = 1; i &lt; 255; i++)
 {
 string ip = ipBase + i.ToString();

 Ping p = new Ping();
 p.PingCompleted += new PingCompletedEventHandler(p_PingCompleted);
 p.SendAsync(ip, 100, ip);
 }
 Console.ReadLine();
 }

 static void p_PingCompleted(object sender, PingCompletedEventArgs e)
 {
 string ip = (string)e.UserState;
 if (e.Reply != null &amp;&amp; e.Reply.Status == IPStatus.Success)
 {
 if (resolveNames)
 {
 string name;
 try
 {
 IPHostEntry hostEntry = Dns.GetHostEntry(ip);
 name = hostEntry.HostName;
 }
 catch (SocketException ex)
 {
 name = "?";
 }
 Console.WriteLine("{0} ({1}) is up: ({2} ms)", ip, name, e.Reply.RoundtripTime);
 }
 else
 {
 Console.WriteLine("{0} is up: ({1} ms)", ip, e.Reply.RoundtripTime);
 }
 lock (lockObj)
 {
 upCount++;
 }
 }
 else if (e.Reply == null)
 {
 Console.WriteLine("Pinging {0} failed. (Null Reply object?)", ip);
 }
 }

 public static string getIPAddress()
 {
 IPHostEntry host;
 string localIP = "";
 host = Dns.GetHostEntry(Dns.GetHostName());
 foreach (IPAddress ip in host.AddressList)
 {
 if (ip.AddressFamily == AddressFamily.InterNetwork)
 {
 localIP = ip.ToString();
 }
 }
 return localIP;
 }
 }
}
</code></pre>

I need to list IP addresses of all connected hosts in my LAN.
What is the simplest way to do this?

How to get IP of all hosts in LAN?

服务器

防火墙

ICMP

DHCP

我需要列出LAN中所有连接的主机的IP地址。执行此操作的最简单方法是什么？

问如何获取局域网内所有主机的IP地址？
EN

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问如何获取局域网内所有主机的IP地址？
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