SoFunction
Updated on 2025-03-09

Get the instance code of the IP address accessed by the client browser

This article introduces the example code to obtain the IP address accessed by the client browser, share it with everyone, and leave a note for yourself.

1. js method

<!DOCTYPE html> 
<html> 
<head> 
  <meta charset="UTF-8" /> 
  <title>Document</title> 
  <script src="/cityjson?ie=utf-8"></script>  
  <script type="text/javascript">  
    ('IP address:' + returnCitySN["cip"] + ', City code:' + returnCitySN["cid"] + ', area:' + returnCitySN["cname"]); 
  </script> 
</head> 
<body>  
</body> 
</html>

2. Background code implementation

#region IP address restriction function 2017-07-18 
 
   /// <summary> 
   ///  
   /// </summary> 
   /// <returns></returns> 
   public bool IsIPValidate() 
   { 
     bool flag = false; 
     string userip = GetLoginIp(); 
     string[] addr = GetAddressByIp(userip); 
     string addrs = addr[0] + addr[1]; 
     if ("Beijing".Equals(addr[0]) || "Beijing".Equals(addr[1])) 
     { 
       flag = true; 
     } 
     return flag; 
   } 
 
 
   /// <summary> 
   /// Get the IP address of the remote access user   /// </summary> 
   /// <returns>Return IP address</returns>   protected string GetLoginIp() 
   { 
     string loginip = ""; 
     //[""]--Get the service variable collection     if (["REMOTE_ADDR"] != null) //Discern whether the IP address of the remote host that issued the request is empty     { 
       //Get the IP address of the remote host that issued the request       loginip = ["REMOTE_ADDR"].ToString(); 
     } 
     //Discern whether the registered user uses the Setup Agent     else if (["HTTP_VIA"] != null) 
     { 
       if (["HTTP_X_FORWARDED_FOR"] != null) 
       { 
         //Get the proxy's server IP address         loginip = ["HTTP_X_FORWARDED_FOR"].ToString(); 
       } 
       else 
       { 
         //Get client IP         loginip = ; 
       } 
     } 
     else 
     { 
       //Get client IP       loginip = ; 
     } 
     return loginip; 
   } 
 
 
 
 
   /// &lt;summary&gt; 
   /// Obtain the province and city according to IP   /// &lt;/summary&gt; 
   public string[] GetAddressByIp(string ip) 
   { 
     string PostUrl = "/iplookup/?ip=" + ip; 
     string res = GetDataByPost(PostUrl);//The data returned by this request is: res=1t115.193.210.0t115.194.201.255tChina tZhejiang t Hangzhou t Telecom     string[] arr = getAreaInfoList(res); 
     return arr; 
   } 
 
 
   /// &lt;summary&gt; 
   /// Post request data   /// &lt;/summary&gt; 
   /// &lt;param name="url"&gt;&lt;/param&gt; 
   /// &lt;returns&gt;&lt;/returns&gt; 
   public string GetDataByPost(string url) 
   { 
     HttpWebRequest req = (HttpWebRequest)(url); 
     string s = "anything"; 
     byte[] requestBytes = (s); 
      = "POST"; 
      = "application/x-www-form-urlencoded"; 
      = ; 
     Stream requestStream = (); 
     (requestBytes, 0, ); 
     (); 
 
 
     HttpWebResponse res = (HttpWebResponse)(); 
     StreamReader sr = new StreamReader((), ); 
     string backstr = (); 
     (); 
     (); 
     return backstr; 
   } 
 
 
   /// &lt;summary&gt; 
   /// Process the required data   /// &lt;/summary&gt; 
   /// &lt;param name="ip"&gt;&lt;/param&gt; 
   /// &lt;returns&gt;&lt;/returns&gt; 
   public static string[] getAreaInfoList(string ipData) 
   { 
     //1t115.193.210.0t115.194.201.255t China t Zhejiang t Hangzhou t Telecom     string[] areaArr = new string[10]; 
     string[] newAreaArr = new string[2]; 
     try 
     { 
       //Get the desired data, only the province and city are taken here       areaArr = ('t'); 
       newAreaArr[0] = areaArr[4];//Province       newAreaArr[1] = areaArr[5];//city     } 
     catch (Exception e) 
     { 
 
 
     } 
     return newAreaArr; 
   } 
 
 
   #endregion

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