Dns.GetHostEntry always give me the old dns ip - c#

I'm using dns to ip script but it always give me the old ip ( maybe it using cache or something like that ) how i can get the new dns ip ?
var ips = System.Net.Dns.GetHostEntry("mann.chickenkiller.com").AddressList;
foreach (var ip in ips)
{
MessageBox.Show(ip.ToString());
}

Related

How to get ipv4 address exactly of another device connected same Wifi network that the client ID was known

How do I get ipv4 of another device connected same wifi network?
I used below code (C# - Unity):
string ipv4 = "";
string hostName = "anp.local";
var host = Dns.GetHostEntry(hostName);
foreach (var ip in host.AddressList)
{
Debug.Log("IP: " + ip.ToString());
if (ip.AddressFamily == AddressFamily.InterNetwork)
{
ipv4 = ip.ToString();
}
}
I got a wrong result: 125.235.4.59 on Window and Android.
Expect result should be 192.168.1.100 (work on Ipad)
My goal is able to connect another device in same wifi network on Window/Android/IOS platforms and I planed using ipv4 for it.

Get my own Local DHCP (or static) IP address that is connected to my LAN/Internet

In C# I wish to get my own DHCP or Static IP address.
I use this code:
string host = Dns.GetHostName();
IPHostEntry ip = Dns.GetHostEntry(host);
Console.WriteLine(ip.AddressList[0].ToString());
and I get these results:
How do I know which one to use? I have virtual PCs installed on this PC as well.
You can use WMI to access network interface properties and find out is DHCP is enabled:
ManagementObjectSearcher searcherNetwork = new ManagementObjectSearcher("root\\CIMV2", "SELECT * FROM Win32_NetworkAdapterConfiguration");
foreach (ManagementObject queryObj in searcherNetwork.Get())
{
foreach (var prop in queryObj.Properties)
{
Console.WriteLine(string.Format("Name: {0} Value: {1}", prop.Name, prop.Value));
}
}
Or you can use NetworkInterface.GetAllNetworkInterfaces() to get more info such as the Name and NetworkInterfaceType (Ethernet, Wireless80211 etc) and filter by those properties
You can also access IPv4InterfaceProperties.IsDhcpEnabled property such as:
foreach (NetworkInterface ni in NetworkInterface.GetAllNetworkInterfaces())
{
Console.WriteLine(ni.GetIPProperties().GetIPv4Properties().IsDhcpEnabled);
}
I have found the answer here:
Get IP Address using C#
This is the code (in case of a broken link. I just did not want to pass this code off as mine you see)
string hostName = Dns.GetHostName(); // Retrive the Name of HOST
Console.WriteLine(hostName);
// Get the IP
string myIP = Dns.GetHostByName(hostName).AddressList[0].ToString();
Console.WriteLine("My IP Address is :"+myIP);

Query Local IP Address

I have the need to know my actual local IP address (i.e. not the loopback address) from a Windows 8 WinRT/Metro app. There are several reasons I need this. The simplest is that in the UI of the app I'd like to show some text like "Your local network IP address is: [IP queried from code]".
We also use the address for some additional network comms. Those comms are perfectly valid because it all works if I look at the IP address in the Control Panel, then hard-code it into the app. Asking the user in a dialog to go look at the address and manually enter it is something I really, really want to avoid.
I would think it wouldn't be a complex task to get the address programmatically, but my search engine and StackOverflow skills are coming up empty.
At this point I'm starting to consider doing a UDP broadcast/listen loop to hear my own request and extract the address from that, but that really seems like a hackey kludge. Is there an API somewhere in the new WinRT stuff that will get me there?
Note that I said "WinRT app. That means the typical mechanisms like Dns.GetHostEntry or NetworkInterface.GetAllInterfaces() aren't going to work.
After much digging, I found the information you need using NetworkInformation and HostName.
NetworkInformation.GetInternetConnectionProfile retrieves the connection profile associated with the internet connection currently used by the local machine.
NetworkInformation.GetHostNames retrieves a list of host names. It's not obvious but this includes IPv4 and IPv6 addresses as strings.
Using this information we can get the IP address of the network adapter connected to the internet like this:
public string CurrentIPAddress()
{
var icp = NetworkInformation.GetInternetConnectionProfile();
if (icp != null && icp.NetworkAdapter != null)
{
var hostname =
NetworkInformation.GetHostNames()
.SingleOrDefault(
hn =>
hn.IPInformation != null && hn.IPInformation.NetworkAdapter != null
&& hn.IPInformation.NetworkAdapter.NetworkAdapterId
== icp.NetworkAdapter.NetworkAdapterId);
if (hostname != null)
{
// the ip address
return hostname.CanonicalName;
}
}
return string.Empty;
}
Note that HostName has properties CanonicalName, DisplayName and RawName, but they all seem to return the same string.
We can also get addresses for multiple adapters with code similar to this:
private IEnumerable<string> GetCurrentIpAddresses()
{
var profiles = NetworkInformation.GetConnectionProfiles().ToList();
// the Internet connection profile doesn't seem to be in the above list
profiles.Add(NetworkInformation.GetInternetConnectionProfile());
IEnumerable<HostName> hostnames =
NetworkInformation.GetHostNames().Where(h =>
h.IPInformation != null &&
h.IPInformation.NetworkAdapter != null).ToList();
return (from h in hostnames
from p in profiles
where h.IPInformation.NetworkAdapter.NetworkAdapterId ==
p.NetworkAdapter.NetworkAdapterId
select string.Format("{0}, {1}", p.ProfileName, h.CanonicalName)).ToList();
}
About the accepted answer, you just need this:
HostName localHostName = NetworkInformation.GetHostNames().FirstOrDefault(h =>
h.IPInformation != null &&
h.IPInformation.NetworkAdapter != null);
You can get the local IP Address this way:
string ipAddress = localHostName.RawName; //XXX.XXX.XXX.XXX
Namespaces used:
using System.Linq;
using Windows.Networking;
using Windows.Networking.Connectivity;

How to detect static ip using win app in c#

Please correct me if i am wrong. There are two types of IP -
One, the static(fixed) IP address we assign to the LAN card and second that we received from the service provider.
For ex. The IP address set for my machine is 192.168.1.10 while the IP address given by ISP is 218.64.xx.xx. (You can check this using http://www.ip2location.com/)
When I use ASP.net, i can get the IP address provided by ISP using -
HttpContext.Current.Request.UserHostAddress;
The Problem:
Now, I am working in Windows Forms environment but unable to get the IP provided by ISP, though I am able to get the fixed IP.
Can anybody help me?
Thanks for sharing your time.
You're trying to get the external IP address of your router.
You need to send an HTTP request to a third-party service which will reply with the IP address.
You can do that using the WebClient class.
For example:
///<summary>Gets the computer's external IP address from the internet.</summary>
static IPAddress GetExternalAddress() {
//<html><head><title>Current IP Check</title></head><body>Current IP Address: 129.98.193.226</body></html>
var html = new WebClient().DownloadString("http://checkip.dyndns.com/");
var ipStart = html.IndexOf(": ", StringComparison.OrdinalIgnoreCase) + 2;
return IPAddress.Parse(html.Substring(ipStart, html.IndexOf("</", ipStart, StringComparison.OrdinalIgnoreCase) - ipStart));
}
The terminology is wrong; your machine has a private IP and a public IP (not "static" and "dynamic").
To get the public IP, you need to bounce off a public server, e.g., whatismyip.org or your own server.
i found manu methods one of them is a html request to http://whatismyip.com
public static IPAddress GetExternalIp()
{
string whatIsMyIp = "http://whatismyip.com";
string getIpRegex = #"(?<=<TITLE>.*)\d*\.\d*\.\d*\.\d*(?=</TITLE>)";
WebClient wc = new WebClient();
UTF8Encoding utf8 = new UTF8Encoding();
string requestHtml = "";
try
{
requestHtml = utf8.GetString(wc.DownloadData(whatIsMyIp));
}
catch (WebException we)
{
// do something with exception
Console.Write(we.ToString());
}
Regex r = new Regex(getIpRegex);
Match m = r.Match(requestHtml);
IPAddress externalIp = null;
if (m.Success)
{
externalIp = IPAddress.Parse(m.Value);
}
return externalIp;
}
or use
IPHostEntry IPHost = Dns.GetHostEntry(Dns.GetHostName());
Console.Write(IPHost.AddressList[0].ToString());
you can try this in the System.Net namespace:
Dns.GetHostAddresses(Dns.GetHostName())
try with this (using System.Net):
IPHostEntry he = Dns.GetHostByName(Dns.GetHostName());
var s = he.AddressList[0].ToString(); // returns IP address

How to get the server IP Address (in C# / asp.net)?

Is there a 1 line method to get the IP Address of the server?
Thanks
Request.ServerVariables["LOCAL_ADDR"];
From the docs:
Returns the server address on which the request came in. This is important on computers where there can be multiple IP addresses bound to the computer, and you want to find out which address the request used.
This is distinct from the Remote addresses which relate to the client machine.
From searching the net I found following code: (I couldn't find a single line method there)
string myHost = System.Net.Dns.GetHostName();
// Show the hostname
MessageBox.Show(myHost);
// Get the IP from the host name
string myIP = System.Net.Dns.GetHostEntry(myHost).AddressList[index].ToString();
// Show the IP
MessageBox.Show(myIP);
-> where index is the index of your ip address host (ie. network connection).
Code from: http://www.geekpedia.com/tutorial149_Get-the-IP-address-in-a-Windows-application.html
As other(s) have posted, System.Net.Dns.GetHostEntry is the way to go. When you access the AddressList property, you'll want to take the AddressFamily property into account, as it could return both IPv4 AND IPv6 results.
This method will return your machine public IP address when run this code on your PC and when you deploy your application on server will return Server IP address.
public static string Getpublicip()
{
try
{
string externalIP = "";
var request = (HttpWebRequest)WebRequest.Create("http://icanhazip.com.ipaddress.com/");
var response = (HttpWebResponse)request.GetResponse();
var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
externalIP = new WebClient().DownloadString("http://icanhazip.com");
return externalIP;
}
catch (Exception e)
{
return "null";
}
}

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