I have been through a lot of googling for this, I found a lot of examples none of which was working for me. This is a simple issue which I feel has a simple answer without defining new classes\modules etc...
My code is this :
Console.WriteLine ("Please enter an IP address or hostname");
string host = Console.ReadLine ();
***IP = resolved "host"***
Socket s = new Socket (AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);
s.Connect (IP, 80);
s.close();
How do I actually resolve the IP variable?
You can simply use the DNS class to do so:
IPHostEntry hostEntry;
hostEntry= Dns.GetHostEntry(host);
//you might get more than one ip for a hostname since
//DNS supports more than one record
if (hostEntry.AddressList.Length > 0)
{
var ip = hostEntry.AddressList[0];
Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);
s.Connect(ip, 80);
}
string howtogeek = "www.howtogeek.com";
IPAddress[] addresslist = Dns.GetHostAddresses(howtogeek);
foreach (IPAddress theaddress in addresslist)
{
Console.WriteLine(theaddress.ToString());
}
from howtogeek
Please take the note that accepted answer can resolve to IPv6. I attempted to connect to service that does not accept IPv6 as input string.
Therefore try this snippet if you care to get IPv4:
using System.Linq;
string host = "google.com";
Dns.GetHostEntry(host).AddressList.First(addr => addr.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
This is the method I use to resolve a hostname to IPv4 and / or IPv6.
using System.Net:
// A host can have multiple IP addresses!
public static IPAddress[] GetIPsByName(string hostName, bool ip4Wanted, bool ip6Wanted)
{
// Check if the hostname is already an IPAddress
IPAddress outIpAddress;
if (IPAddress.TryParse(hostName, out outIpAddress) == true)
return new IPAddress[] { outIpAddress };
//<----------
IPAddress[] addresslist = Dns.GetHostAddresses(hostName);
if (addresslist == null || addresslist.Length == 0)
return new IPAddress[0];
//<----------
if (ip4Wanted && ip6Wanted)
return addresslist;
//<----------
if (ip4Wanted)
return addresslist.Where(o => o.AddressFamily == AddressFamily.InterNetwork).ToArray();
//<----------
if (ip6Wanted)
return addresslist.Where(o => o.AddressFamily == AddressFamily.InterNetworkV6).ToArray();
//<----------
return new IPAddress[0];
}
If all you want is to resolve a string that could represent either a hostname OR an IP address, you probably want to use System.Net.Dns.GetHostAddresses() rather than System.Net.Dns.GetHostEntry().
GetHostAddresses() skips the DNS lookup if the string parses to an IP address already, while GetHostEntry() will do a reverse lookup for the hostname.
https://learn.microsoft.com/en-us/dotnet/api/system.net.dns.gethostaddresses
The IpAddress has the appropriate method for parsing hostname to IpAddress.
IPAddress addr = IPAddress.Parse(hostName)
Related
I try type ipconfig on cmd.exe and ip address ="172.24.70.68"
But If i get IP of this PC, it return IP: 127.0.0.1
This my code get IP Address:
IPAddress ip = null;
IPAddress mask = null;
//++**********************************
// Get IP
//--**********************************
strHostName = Dns.GetHostName();
IPHostEntry iphe = Dns.GetHostEntry(strHostName);
foreach (IPAddress ipheal in iphe.AddressList)
{
if (ipheal.AddressFamily ==AddressFamily.InterNetwork)
{
ip = ipheal;
break;
}
}
Why IP Address return value 127.0.0.1?
Some other PCs, it getting IP is ok.
Try not to get the address via DNS, which may be deceiving or simply not working if for example there are no DNS records for the computer, but via the adapter settings, which is essentially the same ipconfig does.
You can get all of the adapters with NetworkInterface.GetAllNetworkInterfaces(). The NetworkInterfaceType property let's you filter for Ethernet adapters as well as exclude the loop back adapter. You can also filter only for adapters in a particular status, e.g. up, with the OperationalStatus property.
You can then loop through all the unicast addresses of the adapter and pick one of the IPv4 addresses from it, for example the first one encountered. Of course, if you have more adapters or addresses on one adapter this might still not be the one you're looking for. In that case you need to define how to recognize the one you want and implement that accordingly.
IPAddress ip = null;
IPAddress mask = null;
foreach (NetworkInterface networkInterface in NetworkInterface.GetAllNetworkInterfaces())
{
bool found = false;
if (networkInterface.NetworkInterfaceType == NetworkInterfaceType.Ethernet
&& networkInterface.OperationalStatus == OperationalStatus.Up
&& networkInterface.NetworkInterfaceType != NetworkInterfaceType.Loopback)
{
foreach (UnicastIPAddressInformation unicastIPAddressInformation in networkInterface.GetIPProperties().UnicastAddresses)
{
if (unicastIPAddressInformation.Address.AddressFamily == AddressFamily.InterNetwork)
{
ip = unicastIPAddressInformation.Address;
mask = unicastIPAddressInformation.IPv4Mask;
found = true;
break;
}
}
}
if (found)
{
break;
}
}
You need to use forwarder Header
.net core example
services.Configure<ForwardedHeadersOptions>(options =>
{
options.ForwardLimit = 2;
options.KnownProxies.Add(IPAddress.Parse("127.0.10.1"));
options.ForwardedForHeaderName = "X-Forwarded-For-My-Custom-Header-Name";
options.ForwardedHeaders = ForwardedHeaders.XForwardedFor |
ForwardedHeaders.XForwardedProto;
});
anyone know why when I run this code
IPHostEntry
IPHost = System.Net.Dns.GetHostEntry(System.Net.Dns.GetHostName());
foreach
(var
ipAddress in
IPHost.AddressList)
{
IPlabel.Content = ipAddress;
}
It returns it in a format of: 2001:1:9d39:6 ...?
Id be looking to get this in format of IPv4: xxx.xxx.xxx.xxx
Not sure if theirs a duplicate post or not, I've been looking for quite some time. I might not be using the right search key words
Appreciate any help &or post you folks could provide.
I believe this has been answered here?
Getting the ip-address
// return the first IPv4, non-dynamic/link-local, non-loopback address
public static IPAddress GetIPAddress()
{
IPAddress[] hostAddresses = Dns.GetHostAddresses("");
foreach (IPAddress hostAddress in hostAddresses)
{
if (hostAddress.AddressFamily == AddressFamily.InterNetwork &&
!IPAddress.IsLoopback(hostAddress) && // ignore loopback addresses
!hostAddress.ToString().StartsWith("169.254.")) // ignore link-local addresses
return hostAddress;
}
return null; // or IPAddress.None if you prefer
}
I don't know if I'm just not searching using the right keywords, I want to be able to find the IP address of my local computer that was assigned by my router.
I was using:
IPHostEntry host;
host = Dns.GetHostEntry(Dns.GetHostName());
foreach(IPAddress ip in host.AddressList)
{
if(ip.addressfamily.tostring() == "InterNetwork")
{
return ip;
}
}
The problem is I have multiple InterNetwork ip addresses because I use virtual services, so I need to be able to identify which one was assigned by my router.
How about loopback?
if (IPAddress.IsLoopback(ip)) return ip; //localhost
Or try pinging the local machine
Ping pingSender = new Ping ();
IPAddress address = IPAddress.Loopback;
PingReply reply = pingSender.Send (address);
if (reply.Status == IPStatus.Success){..}
also this might help you
Showing The External IP-Address In C#
public Server([Optional, DefaultParameterValue(0x6c1)] int port, [Optional, DefaultParameterValue("127.0.0.1")] string ip)
{
this.IP = IPAddress.Parse(ip);
this.Port = port;
this.listenerConnection = new TcpListener(this.IP, this.Port);
this.listenerConnection.Start();
this.listenerThread = new Thread(new ThreadStart(this.listen));
this.listenerThread.Start();
}
is the code I have, it runs fine but when I debug it, I get the message:
Specified argument was out of the range of valid values. Parameter name: port
Can anyone help?
Well, then port is out of the range of valid values, which is between IPEndPoint.MinPort and IPEndPoint.MaxPort.
Have you tried using the IPAddress of your machine? You can use the following code to obtain the IPAddress of the machine you are running the application on:
IPHostEntry host = Dns.GetHostEntry(Dns.GetHostName());
IPAddress localIpAddress = null;
forach(IPAddress address in host.AddressList)
{
if(address.AddressFamily == AddressFamily.InterNetwork)
{
localIpAddress = address;
}
}
TcpListener listener = new TcpListener(localIpAddress, port);
listener.Start();
Additionally, you may want to consider using a default port > 5000. As there are many ports between 0 and 5000 that are reserved or already use by services.
C#, how do i get an ip address, from a TcpClient?
I have a TcpClient and i want to get it's name.
Assuming you want the remote end point:
IPEndPoint ipep = (IPEndPoint)myTcpClient.RemoteEndPoint;
IPAddress ipa = ipep.Address;
Say you have a TcpClient instance called MyTcpClient.
private string IPAddress
{
get
{
IPEndPoint ep = MyTcpClient.Client.RemoteEndPoint as IPEndPoint;
if (ep == null)
return "unknown";
return ep.Address.ToString();
}
}
In case what you need is the local address instead you can use LocalEndPoint instead of RemoteEndPoimt in the previous replies.