Get a machines MAC address on the local network from its IP in C#

Question

I am trying write a function that takes a single IP address as a parameter and queries that machine on my local network for it\'s MAC address.

Answer 1

public string GetMacAddress(string ipAddress)
{
    string macAddress = string.Empty;
    System.Diagnostics.Process pProcess = new System.Diagnostics.Process();
    pProcess.StartInfo.FileName = "arp";
    pProcess.StartInfo.Arguments = "-a " + ipAddress;
    pProcess.StartInfo.UseShellExecute = false;
    pProcess.StartInfo.RedirectStandardOutput = true;
      pProcess.StartInfo.CreateNoWindow = true;
    pProcess.Start();
    string strOutput = pProcess.StandardOutput.ReadToEnd();
    string[] substrings = strOutput.Split('-');
    if (substrings.Length >= 8)
    {
       macAddress = substrings[3].Substring(Math.Max(0, substrings[3].Length - 2)) 
                + "-" + substrings[4] + "-" + substrings[5] + "-" + substrings[6] 
                + "-" + substrings[7] + "-" 
                + substrings[8].Substring(0, 2);
        return macAddress;
    }

    else
    {
        return "not found";
    }
}

Very late edit: In open souce project iSpy (https://github.com/ispysoftware/iSpy) they use this code, which is a little nicer

  public static void RefreshARP()
        {
            _arpList = new Dictionary();
            _arpList.Clear();
            try
            {
                var arpStream = ExecuteCommandLine("arp", "-a");
                // Consume first three lines
                for (int i = 0; i < 3; i++)
                {
                    arpStream.ReadLine();
                }
                // Read entries
                while (!arpStream.EndOfStream)
                {
                    var line = arpStream.ReadLine();
                    if (line != null)
                    {
                        line = line.Trim();
                        while (line.Contains("  "))
                        {
                            line = line.Replace("  ", " ");
                        }
                        var parts = line.Trim().Split(' ');

                        if (parts.Length == 3)
                        {
                            string ip = parts[0];
                            string mac = parts[1];
                            if (!_arpList.ContainsKey(ip))
                                _arpList.Add(ip, mac);
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                Logger.LogExceptionToFile(ex, "ARP Table");
            }
            if (_arpList.Count > 0)
            {
                foreach (var nd in List)
                {
                    string mac;
                    ARPList.TryGetValue(nd.IPAddress.ToString(), out mac);
                    nd.MAC = mac;    
                }
            }
        }

https://github.com/ispysoftware/iSpy/blob/master/Server/NetworkDeviceList.cs

Update 2 even more late, but I think is best because it uses regex that checks better for exact matches.

public string getMacByIp(string ip)
{
    var macIpPairs = GetAllMacAddressesAndIppairs();
    int index = macIpPairs.FindIndex(x => x.IpAddress == ip);
    if (index >= 0)
    {
        return macIpPairs[index].MacAddress.ToUpper();
    }
    else
    {
        return null;
    }
}

public List GetAllMacAddressesAndIppairs()
{
    List mip = new List();
    System.Diagnostics.Process pProcess = new System.Diagnostics.Process();
    pProcess.StartInfo.FileName = "arp";
    pProcess.StartInfo.Arguments = "-a ";
    pProcess.StartInfo.UseShellExecute = false;
    pProcess.StartInfo.RedirectStandardOutput = true;
    pProcess.StartInfo.CreateNoWindow = true;
    pProcess.Start();
    string cmdOutput = pProcess.StandardOutput.ReadToEnd();
    string pattern = @"(?([0-9]{1,3}\.?){4})\s*(?([a-f0-9]{2}-?){6})";

    foreach (Match m in Regex.Matches(cmdOutput, pattern, RegexOptions.IgnoreCase))
    {
        mip.Add(new MacIpPair()
        {
            MacAddress = m.Groups["mac"].Value,
            IpAddress = m.Groups["ip"].Value
        });
    }

    return mip;
}
public struct MacIpPair
{
    public string MacAddress;
    public string IpAddress;
}