C# || How To Get The Computer & User Client IP Address Using C#

May 13, 2021 admin No comments

The following is a module with functions which demonstrates how to get the computers and user client request IPv4 IP address using C#.

The function demonstrated on this page returns the IPv4 address of the calling user. When under a web environment, it returns the clients System.Web.HttpContext.Current.Request IP address, otherwise it returns the IP address of the local machine (i.e: server) if there is no request.

The following function uses System.Web to determine the IP address of the client.

Note: To use the function in this module, make sure you have a reference to ‘System.Web‘ in your project.

One way to do this is, in your Solution Explorer (where all the files are shown with your project), right click the ‘References‘ folder, click ‘Add Reference‘, then type ‘System.Web‘ in the search box, and add the reference titled System.Web in the results Tab.

1. Get IP Address

The example below demonstrates the use of ‘Utils.Methods.GetIPv4Address‘ to get the IPv4 address of the calling user.





		
		
			1. Get IP Address
			
C#
			
			// Get IP Address

// Get IP address of the current user
var ipAddress = Utils.Methods.GetIPv4Address();

Console.WriteLine($"IP Address: {ipAddress}");

// example output:
/*
    IP Address: 192.168.0.5 
*/
			
				
					
				
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						// Get IP Address
 
// Get IP address of the current user
var ipAddress = Utils.Methods.GetIPv4Address();
 
Console.WriteLine($"IP Address: {ipAddress}");
 
// example output:
/*
    IP Address: 192.168.0.5 
*/

2. Utils Namespace

The following is the Utils Namespace. Include this in your project to start using!





		
		
			Utils Namespace
			
C#
			
			// ============================================================================
//    Author: Kenneth Perkins
//    Date:   May 13, 2021
//    Taken From: http://programmingnotes.org/
//    File:  Utils.cs
//    Description: Handles general utility functions
// ============================================================================
using System;
using System.Linq;

namespace Utils {
    public static class Methods {
        /// <summary>
        /// Returns the IPv4 address of the calling user. When under a web
        /// environment, returns the <see cref="System.Web.HttpRequest"/> 
        /// IP address, otherwise returns the IP address of the local machine
        /// </summary>
        /// <returns>The IPv4 address of the calling user</returns>
        public static string GetIPv4Address() {
            var ipAddress = string.Empty;

            // Get client ip address
            if (System.Web.HttpContext.Current != null 
                && System.Web.HttpContext.Current.Request != null) {

                // Get client ip address using ServerVariables
                var request = System.Web.HttpContext.Current.Request;
                ipAddress = request.ServerVariables["HTTP_X_FORWARDED_FOR"];
                if (!string.IsNullOrEmpty(ipAddress)) {
                    var addresses = ipAddress.Split(",".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
                    if (addresses.Length > 0) {
                        ipAddress = addresses[0];
                    }
                }
                if (string.IsNullOrEmpty(ipAddress)) {
                    ipAddress = request.ServerVariables["REMOTE_ADDR"];
                }

                // Get client ip address using UserHostAddress
                if (string.IsNullOrEmpty(ipAddress)) {
                    var clientIPA = GetNetworkAddress(request.UserHostAddress);
                    if (clientIPA != null) {
                        ipAddress = clientIPA.ToString();
                    }
                }
            }

            // Get local machine ip address
            if (string.IsNullOrEmpty(ipAddress)) {
                var loacalIPA = GetNetworkAddress(System.Net.Dns.GetHostName());
                if (loacalIPA != null) {
                    ipAddress = loacalIPA.ToString();
                }
            }
            return ipAddress;
        }

        private static System.Net.IPAddress GetNetworkAddress(string addresses) {
            return System.Net.Dns.GetHostAddresses(addresses)
               .FirstOrDefault(x => x.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork);
        }
    }
}// http://programmingnotes.org/
			
				
					
				
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						// ============================================================================
//    Author: Kenneth Perkins
//    Date:   May 13, 2021
//    Taken From: http://programmingnotes.org/
//    File:  Utils.cs
//    Description: Handles general utility functions
// ============================================================================
using System;
using System.Linq;
 
namespace Utils {
    public static class Methods {
        /// <summary>
        /// Returns the IPv4 address of the calling user. When under a web
        /// environment, returns the <see cref="System.Web.HttpRequest"/> 
        /// IP address, otherwise returns the IP address of the local machine
        /// </summary>
        /// <returns>The IPv4 address of the calling user</returns>
        public static string GetIPv4Address() {
            var ipAddress = string.Empty;
 
            // Get client ip address
            if (System.Web.HttpContext.Current != null 
                && System.Web.HttpContext.Current.Request != null) {
 
                // Get client ip address using ServerVariables
                var request = System.Web.HttpContext.Current.Request;
                ipAddress = request.ServerVariables["HTTP_X_FORWARDED_FOR"];
                if (!string.IsNullOrEmpty(ipAddress)) {
                    var addresses = ipAddress.Split(",".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
                    if (addresses.Length > 0) {
                        ipAddress = addresses[0];
                    }
                }
                if (string.IsNullOrEmpty(ipAddress)) {
                    ipAddress = request.ServerVariables["REMOTE_ADDR"];
                }
 
                // Get client ip address using UserHostAddress
                if (string.IsNullOrEmpty(ipAddress)) {
                    var clientIPA = GetNetworkAddress(request.UserHostAddress);
                    if (clientIPA != null) {
                        ipAddress = clientIPA.ToString();
                    }
                }
            }
 
            // Get local machine ip address
            if (string.IsNullOrEmpty(ipAddress)) {
                var loacalIPA = GetNetworkAddress(System.Net.Dns.GetHostName());
                if (loacalIPA != null) {
                    ipAddress = loacalIPA.ToString();
                }
            }
            return ipAddress;
        }
 
        private static System.Net.IPAddress GetNetworkAddress(string addresses) {
            return System.Net.Dns.GetHostAddresses(addresses)
               .FirstOrDefault(x => x.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork);
        }
    }
}// http://programmingnotes.org/

3. More Examples

Below are more examples demonstrating the use of the ‘Utils‘ Namespace. Don’t forget to include the module when running the examples!





		
		
			More Examples
			
C#
			
			// ============================================================================
//    Author: Kenneth Perkins
//    Date:   May 13, 2021
//    Taken From: http://programmingnotes.org/
//    File:  Program.cs
//    Description: The following demonstrates the use of the Utils Namespace
// ============================================================================
using System;
using System.Diagnostics;

public class Program {
    static void Main(string[] args) {
        try {
            // Get IP address of the current user
            var ipAddress = Utils.Methods.GetIPv4Address();

            Display($"IP Address: {ipAddress}");
        } catch (Exception ex) {
            Display(ex.ToString());
        } finally {
            Console.ReadLine();
        }
    }

    static void Display(string message) {
        Console.WriteLine(message);
        Debug.Print(message);
    }
}// http://programmingnotes.org/
			
				
					
				
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						// ============================================================================
//    Author: Kenneth Perkins
//    Date:   May 13, 2021
//    Taken From: http://programmingnotes.org/
//    File:  Program.cs
//    Description: The following demonstrates the use of the Utils Namespace
// ============================================================================
using System;
using System.Diagnostics;
 
public class Program {
    static void Main(string[] args) {
        try {
            // Get IP address of the current user
            var ipAddress = Utils.Methods.GetIPv4Address();
 
            Display($"IP Address: {ipAddress}");
        } catch (Exception ex) {
            Display(ex.ToString());
        } finally {
            Console.ReadLine();
        }
    }
 
    static void Display(string message) {
        Console.WriteLine(message);
        Debug.Print(message);
    }
}// http://programmingnotes.org/

QUICK NOTES:
The highlighted lines are sections of interest to look out for.

The code is heavily commented, so no further insight is necessary. If you have any questions, feel free to leave a comment below.

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Posted in: C#, Console Tags: c-sharp, get ip address

C# || How To Get The Computer & User Client IP Address Using C#

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