HostName, IP, and MAC Address - CodeProject

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Sample Image - Host_Info_within_Network.jpg

Introduction

This article is used to get the intranet information in a network. It shows information like the host name, corresponding IP address and also physical address.

Using the code

The code retrieves all the System names using the Directory entries information.

//       // Use Your work Group WinNT://Baba(Work Group Name)
//     DirectoryEntry DomainEntry = 
//         new DirectoryEntry("WinNT://" + this.TxtWorkGroup.Text.Trim());
//     DomainEntry.Children.SchemaFilter.Add("computer");

Then we collect the IP address using the DNS.

//    System.Net.IPHostEntry Tempaddr = 
 //     (System.Net.IPHostEntry)Dns.GetHostByName(machine.Name);
//    System.Net.IPAddress[] TempAd = Tempaddr.AddressList;

The physical MAC address is collected using the DLL "iphlpapi.dll" with the API SendARP().

For each System, we use the Hostname to retrieve the MAC address.

//    [DllImport("iphlpapi.dll", ExactSpelling=true)]
//    public static extern int SendARP( int DestIP, int SrcIP, 
//         [Out] byte[] pMacAddr, ref int PhyAddrLen );

Points of Interest

This is my first article in CodeProject.

History

01/24/2005
Article released.

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

About the Author

MahendranG

Technical Lead

India

Member

I loves computers. I am interested in programming such like Networking using Sockets, Imaging, Telecom and robotics.

I am very much interested in programming in windows and Linux.

I am working with Verizon Data Services India Ltd.,

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Hello, I have implemented this code to trace the MAC address in a windows application, while it worked perfectly well in Windows XP and Vista, it gives no result in Windows 7. Really unable to figure out y.
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Write the line given below in your aspx page this shall give you the account user name accessing the page Page.User.Identity.Name.ToString();
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Nice article! It helped me out alot! I used your code for writing an ASP.Net version. thanks again!
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Hi, this utility is exactly what iam looking for. Unfortunately when I try to run HostNIPAddr.exe I get the error message. The error is in Slovak language, so that I dont put it here. I run WinXP SP2. What can I do to make it run?
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hi, i want to get all WorkGroup names Available in my Lan. how i do this. I used some Coding.but not well. So i need Solution For this. thanks & Regards, Gowri.g
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Hi!

In my application i used this code to find all systems connected in LAN.But it return some systems only. this is the code

Dim childEntry As DirectoryEntry
Dim ParentEntry As New DirectoryEntry()
Try
ParentEntry.Path = "WinNT:"
For Each childEntry In ParentEntry.Children
Dim newNode As New TreeNode(childEntry.Name)
Select Case childEntry.SchemaClassName
Case "Domain"
Dim ParentDomain As New TreeNode(childEntry.Name)
TreeView1.Nodes.AddRange(New TreeNode() {ParentDomain})
Dim SubChildEntry As DirectoryEntry
Dim SubParentEntry As New DirectoryEntry()
SubParentEntry.Path = "WinNT://" & childEntry.Name
For Each SubChildEntry In SubParentEntry.Children
Dim newNode1 As New TreeNode(SubChildEntry.Name)
Select Case SubChildEntry.SchemaClassName
Case "Computer"
ParentDomain.Nodes.Add(newNode1)
End Select
Next
End Select
Next
Catch Excep As Exception
MsgBox("Error While Reading Directories")
Finally
ParentEntry = Nothing
End Try

In that the
SubChildEntry.SchemaClassName its return value like "Schema" instead of "Computers".For this i'm not able to list out all systems in my LAN.

Can you give solution for this .plz

Regards,
Anand.M

sorry my english.

this exmple it's amazing but no working in other range IP.

for example:
10.2.1.1 , 10.2.1.56 , etc
mac ok

but 64.233.169.99 no
mac: 00:00:00:00 why?

please helpme. this is very important.

im create a function just mac for an IP, the code is succesfull.

using System;
using System.Collections;
using System.Runtime.InteropServices;

public class MAC
{
[DllImport("iphlpapi.dll", ExactSpelling = true)]
private static extern int SendARP(int DestIP, int SrcIP, [Out] byte[] pMacAddr, ref int PhyAddrLen);

public string getmac(string ip)
{
System.Net.IPAddress TempAD = System.Net.IPAddress.Parse(ip);

byte[] ab = new byte[6];
int len = ab.Length;

// This Function Used to Get The Physical Address
int r = SendARP((int)TempAD.Address, 0, ab, ref len);
string mac = BitConverter.ToString(ab, 0, 6);
//msgbox(mac);
return mac;
}
}

Thank you for the code example. However, you should try harder to use more english-like variable names instead of acronyms. (This helps people understand it easier). for example, you use: byte[] ab = new byte[6]; you should use: byte[] macAddressBytes = new byte[6]; Don't be so lazy when you code, it makes it really hard to understand (as well as maintain) your code later on.
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I have error in programming! so I need your asistance. desciption: <img scr="http://aycu20.webshots.com/image/16019/2005784138176631572_rs.jpg"> QuangLam
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I have been trying to solve on how to detect IP addresses based on my installed printer drivers around my network but I am getting frustrated each day..heheh.. Win32_Printer, Win32_NetworkAdapter and Win32_TCPIPPrinter failed to get the information that I want.. if you're kind enough share your knowledge to email it to me at janverge@gmail.com I am using C# as well. nice one..
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General News Suggestion Question Bug Answer Joke Rant Admin

This will guide you to understand and trace network host information, IP, and MAC address information.

Type	Article
Licence
First Posted	23 Jan 2005
Views	190,708
Bookmarked	89 times

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