Develop Reference

I want to get IP addresses of users who enter my site with Asp.net core

var webClient = new WebClient();
var ipAddress = webClient.DownloadString("http://checkip.dyndns.org");
ipAddress = (new Regex(#"\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b")).Match(ipAddress).Value;
// gives my site IP address

Use this:
this.HttpContext.Connection.RemoteIpAddress
It tells you about requester's host address and port number. Access this object inside your controller. It's usaually available in the form of HttpContext.Request.Host

How to Find User's IP address

I need help to find user's IP address who are browsing to my site (using C# Code).
I am confused about system IP address, ISP IP address, Network address and what is IPV4 and IPV6.
Below is the code I got from other source:
protected string GetUserIP()
{
string userIP = string.Empty;
HttpContext context = System.Web.HttpContext.Current;
string ipAddress = context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
if (!string.IsNullOrEmpty(ipAddress))
{
string[] addresses = ipAddress.Split(',');
if (addresses.Length != 0)
{
userIP = addresses[0];
}
}
else if (HttpContext.Current.Request.UserHostAddress.Length != 0)
{
userIP = HttpContext.Current.Request.UserHostAddress;
}
return userIP;
}
But here I am not getting the expected result.
When test this in my local-host I got 127.0.0.1
When I deploy this into my development server and browse the page in my local machine, I got different address.
I tried accessing the same URL in other machine and IP address are same.
The systems I am using to access my development server deployed page in in same network.
So is it the network IP my code returned..?
Because when I find my IP using ipconfig command it's again a different!
And when I checked my IP using 3rd party site (http://www.whatismyip.com/ip-address-lookup/), it shows the actual IP I expected. How can I get that actual IP using C# code?
My ultimate goal is, get the user location details who is browsing my site using Maxmind City DB, but for that I need to pass the IP of browsing user.
string ip = GetUserIP();
string db = “GeoIP2-City.mmdb";
var reader = new DatabaseReader(db);
var city = reader.City(ip);
double? lat = city.Location.Latitude;
double? lang = city.Location.Longitude;
For the IP I got from my above code, I got exception (IP not found in Database) when I tried to get information from Maxmind DB,
but for the IP I got from "whatismyip" website, I got the details from the Maxmind DB.
Hope My question is clear.
Please let me know if anyone have any inputs.
Thanks,
Sharath

I guess this will help
public String GetLanIPAddress()
{
//The X-Forwarded-For (XFF) HTTP header field is a de facto standard for identifying the originating IP address of a
//client connecting to a web server through an HTTP proxy or load balancer
String ip = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
if (string.IsNullOrEmpty(ip))
{
ip = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
}
return ip;
}

How to obtain local ip address

I've managed to get clients' ip addresses from my server using codes below
OperationContext context = OperationContext.Current;
MessageProperties prop = context.IncomingMessageProperties;
RemoteEndpointMessageProperty endpoint = prop[RemoteEndpointMessageProperty.Name] as RemoteEndpointMessageProperty;
string ipaddress = endpoint.Address;
However, if clients are under the same network, all the ip addresses are public ip address of the network.
Is there a way to get local ip addresses of each client if they are under the same AP?
or just simply, is there a easier way to distinguish client from one another?

Because of network address translation it is not always possible to identify clients by unique client addresses see How to get a user's client IP address in ASP.NET?

try this
HttpRequest currentRequest = HttpContext.Current.Request;
string ipAddress = currentRequest.ServerVariables["HTTP_X_FORWARDED_FOR"];
if (ipAddress == null || ipAddress.ToLower() == "unknown")
ipAddress = currentRequest.ServerVariables["REMOTE_ADDR"];
return ipAddress;

You can try webrtc's in built feature to connect to STUN server https://diafygi.github.io/webrtc-ips/

Wrong client IP address

I'm getting client IP address from ASP.NET. But some client IP address received 127.0.0.1.
What is problem. How getting valid client ip address?
I'm using this code:
public static string GetIP()
{
string clientIp = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
if (!string.IsNullOrEmpty(clientIp))
{
string[] forwardedIps = clientIp.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
clientIp = forwardedIps[forwardedIps.Length - 1];
}
if (string.IsNullOrEmpty(clientIp))
clientIp = HttpContext.Current.Request.ServerVariables["HTTP_CLIENT_IP"];
if (string.IsNullOrEmpty(clientIp))
clientIp = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
return clientIp.ToString();
}

127.0.0.1 is localhost, i.e. the same machine is making the request as is hosting it.
My guess is that what you are seeing is infact your own testing or debugging?
I'd consider Request.IsLocal() as a good way to find out.

How to get LAN IP of a client using .net?

I want to get the adrress IP (LAN ip) of the computer which access my site.
How can i get it?

You can't.
Browsers don't send their local IPs in HTTP headers, so there is no way for you to get it. You only get the router's external (internet) IP.

Method 1:
You can get that by using below mentioned link.
List the IP Address of all computers connected to a single LAN
Method 2:
You can try below one also.
public string GetUserIP()
{
string ipList = Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
if (!string.IsNullOrEmpty(ipList))
{
return ipList.Split(',')[0];
}
return Request.ServerVariables["REMOTE_ADDR"];
}
Method 3:
System.Net.Dns.GetHostEntry(System.Net.Dns.GetHostName()).AddressList.GetValue(0).ToString();
I hope this will help to you.

I assume you're using asp.net and in that case you could use Request.UserHostAddress to retrieve the IP address of a client.

Use this function:
public string GetLanIP()
{
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;
}