How to get the public IP address of a user in C

Question

I want the public IP address of the client who is using my website  The code below is showing the local IP in the LAN  but I want the public IP of the client     get mac address NetworkInterface   nics   NetworkInterface GetAllNetworkInterfaces    String sMacAddress   string Empty  foreach  NetworkInterface adapter in nics        if  sMacAddress    String Empty    only return MAC Address from first card                 IPInterfaceProperties properties   adapter GetIPProperties            sMacAddress   adapter GetPhysicalAddress   ToString               To Get IP Address   string IPHost   Dns GetHostName    string IP   Dns GetHostByName IPHost  AddressList 0  ToString      Output       Ip Address   192 168 1 7   Please help me to get the public IP address

User · Answer

string IP   HttpContext Current Request Params  HTTP CLIENT IP      HttpContext Current Request UserHostAddress

User · Answer

just use this                    public string GetIP        string externalIP          externalIP    new WebClient    DownloadString  http   checkip dyndns org        externalIP    new Regex    d 1 3    d 1 3    d 1 3    d 1 3     Matches externalIP  0  ToString       return externalIP

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I have an extension method   public static string GetIp this HttpContextBase context        if  context    null    context Request    null          return string Empty       return context Request ServerVariables  HTTP X FORWARDED FOR                  context Request UserHostAddress      Note   HTTP X FORWARDED FOR  is for ip behind proxy  context Request UserHostAddress is identical to  REMOTE ADDR     But bear in mind it is not necessary the actual IP though   Sources   IIS Server Variables  Link

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My version handles both ASP NET or LAN IPs           Get visitor s ip address      public static string GetVisitorIp         string ip   null      if  HttpContext Current    null       ASP NET         ip   string IsNullOrEmpty HttpContext Current Request ServerVariables  HTTP X FORWARDED FOR                  HttpContext Current Request UserHostAddress               HttpContext Current Request ServerVariables  HTTP X FORWARDED FOR              if  string IsNullOrEmpty ip     ip Trim         1        still can t decide or is LAN         var lan   Dns GetHostEntry Dns GetHostName    AddressList FirstOrDefault r   gt  r AddressFamily    AddressFamily InterNetwork           ip   lan    null   string Empty   lan ToString              return ip

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So many of these code snippets are really big and could confuse new programmers looking for help   How about this simple and compact code to fetch the IP address of the visitor   string ip   System Web HttpContext Current Request ServerVariables  HTTP X FORWARDED FOR            if  string IsNullOrEmpty ip                         ip   System Web HttpContext Current Request ServerVariables  REMOTE ADDR                Simple  short and compact

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We connect to servers that give us our external IP address and try to parse the IP from returning HTML pages  But when servers make small changes on these pages or remove them  these methods stop working properly   Here is a method that takes the external IP address using a server which has been alive for years and returns a simple response rapidly    https   www codeproject com Tips 452024 Getting-the-External-IP-Address  Private string getExternalIp     try       string externalIP      externalIP    new      WebClient    DownloadString  http   checkip dyndns org         externalIP    new Regex    d 1 3    d 1 3    d 1 3    d 1 3                       Matches externalIP  0  ToString        return externalIP    catch   return null        VB NET  Imports System Net Private Function GetExternalIp   As String Try     Dim ExternalIP As String     ExternalIP    New WebClient    DownloadString  http   checkip dyndns org        ExternalIP    New Regex   d 1 3    d 1 3    d 1 3    d 1 3                         Matches ExternalIP  0  ToString       Return ExternalIP Catch     Return Nothing End Try   End Function

User · Answer

Combination of all of these suggestions  and the reasons behind them  Feel free to add more test cases too  If getting the client IP is of utmost importance  than you might wan to get all of theses are run some comparisons on which result might be more accurate   Simple check of all suggestions in this thread plus some of my own code         using System IO      using System Net       public string GetUserIP                 string strIP   String Empty          HttpRequest httpReq   HttpContext Current Request             test for non-standard proxy server designations of client s IP         if  httpReq ServerVariables  HTTP CLIENT IP      null                        strIP   httpReq ServerVariables  HTTP CLIENT IP   ToString                      else if  httpReq ServerVariables  HTTP X FORWARDED FOR      null                        strIP   httpReq ServerVariables  HTTP X FORWARDED FOR   ToString                        test for host address reported by the server         else if                         if exists              httpReq UserHostAddress Length    0               amp  amp                and if not localhost IPV6 or localhost name               httpReq UserHostAddress       1       httpReq UserHostAddress     localhost                                    strIP   httpReq UserHostAddress                      finally  if all else fails  get the IP from a web scrape of another server         else                       WebRequest request   WebRequest Create  http   checkip dyndns org                 using  WebResponse response   request GetResponse                using  StreamReader sr   new StreamReader response GetResponseStream                                   strIP   sr ReadToEnd                                scrape ip from the html             int i1   strIP IndexOf  Address       9              int i2   strIP LastIndexOf   lt  body gt                 strIP   strIP Substring i1  i2 - i1                     return strIP

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In MVC IP can be obtained by the following Code  string ipAddress   Request ServerVariables  REMOTE ADDR

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On MVC 5 you can use this   string cIpAddress   Request UserHostAddress    Gets the client ip address   or  string cIpAddress   Request ServerVariables  REMOTE ADDR      Gets the client ip address

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That code gets you the IP address of your server not the address of the client who is accessing your website   Use the HttpContext Current Request UserHostAddress property to the client s IP address

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lblmessage Text  Request ServerVariables  REMOTE HOST   ToString

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private string GetClientIpaddress                 string ipAddress   string Empty          ipAddress   HttpContext Current Request ServerVariables  HTTP X FORWARDED FOR            if  ipAddress          ipAddress    null                        ipAddress   HttpContext Current Request ServerVariables  REMOTE ADDR                return ipAddress                    else                       return ipAddress

User · Answer

You can use  HTTP X FORWARDED FOR  or  REMOTE ADDR  header attribute   Refer method GetVisitorIPAddress from Machine Syntax blog             lt summary gt          method to get Client ip address          lt  summary gt           lt param name  GetLan  gt  set to true if want to get local LAN  Connected ip address lt  param gt           lt returns gt  lt  returns gt      public static string GetVisitorIPAddress bool GetLan   false                string visitorIPAddress   HttpContext Current Request ServerVariables  HTTP X FORWARDED FOR             if  String IsNullOrEmpty visitorIPAddress               visitorIPAddress   HttpContext Current Request ServerVariables  REMOTE ADDR             if  string IsNullOrEmpty visitorIPAddress               visitorIPAddress   HttpContext Current Request UserHostAddress           if  string IsNullOrEmpty visitorIPAddress     visitorIPAddress Trim         1                         GetLan   true              visitorIPAddress   string Empty                     if  GetLan  amp  amp  string IsNullOrEmpty visitorIPAddress                               This is for Local LAN  Connected ID Address                 string stringHostName   Dns GetHostName                      Get Ip Host Entry                 IPHostEntry ipHostEntries   Dns GetHostEntry stringHostName                     Get Ip Address From The Ip Host Entry Address List                 IPAddress   arrIpAddress   ipHostEntries AddressList                   try                                       visitorIPAddress   arrIpAddress arrIpAddress Length - 2  ToString                                      catch                                       try                                               visitorIPAddress   arrIpAddress 0  ToString                                              catch                                               try                                                       arrIpAddress   Dns GetHostAddresses stringHostName                               visitorIPAddress   arrIpAddress 0  ToString                                                      catch                                                       visitorIPAddress    127 0 0 1                                                                                          return visitorIPAddress

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This is what I use   protected void GetUser IP         string VisitorsIPAddr   string Empty      if  HttpContext Current Request ServerVariables  HTTP X FORWARDED FOR      null                VisitorsIPAddr   HttpContext Current Request ServerVariables  HTTP X FORWARDED FOR   ToString              else if  HttpContext Current Request UserHostAddress Length    0                VisitorsIPAddr   HttpContext Current Request UserHostAddress            uip Text    Your IP is      VisitorsIPAddr       uip  is the name of the label in the aspx page that shows the user IP

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For Web Applications   ASP NET MVC and WebForm         lt summary gt      Get current user ip address       lt  summary gt       lt returns gt The IP Address lt  returns gt  public static string GetUserIPAddress         var context   System Web HttpContext Current      string ip   String Empty       if  context Request ServerVariables  HTTP X FORWARDED FOR      null          ip   context Request ServerVariables  HTTP X FORWARDED FOR   ToString        else if   String IsNullOrWhiteSpace context Request UserHostAddress           ip   context Request UserHostAddress       if  ip       1           ip    127 0 0 1        return ip      For Windows Applications   Windows Form  Console  Windows Service              static void Main string   args                HTTPGet req   new HTTPGet            req Request  http   checkip dyndns org            string   a   req ResponseBody Split               string a2   a 1  Substring 1           string   a3 a2 Split   lt             string a4   a3 0           Console WriteLine a4           Console ReadLine

[c#] How to get the public IP address of a user in C#

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