Reliable Method to Get Machine'S MAC Address in C#

Getting MAC Address C#

i am using following code to access mac address in format you want :

public string GetSystemMACID()
        {
            string systemName = System.Windows.Forms.SystemInformation.ComputerName;
            try
            {
                ManagementScope theScope = new ManagementScope("\\\\" + Environment.MachineName + "\\root\\cimv2");
                ObjectQuery theQuery = new ObjectQuery("SELECT * FROM Win32_NetworkAdapter");
                ManagementObjectSearcher theSearcher = new ManagementObjectSearcher(theScope, theQuery);
                ManagementObjectCollection theCollectionOfResults = theSearcher.Get();

                foreach (ManagementObject theCurrentObject in theCollectionOfResults)
                {
                    if (theCurrentObject["MACAddress"] != null)
                    {
                        string macAdd = theCurrentObject["MACAddress"].ToString();
                        return macAdd.Replace(':', '-');
                    }
                }
            }
            catch (ManagementException e)
            {
                           }
            catch (System.UnauthorizedAccessException e)
            {

            }
            return string.Empty;
        }

C# Get Computer's MAC address OFFLINE

From WMI:

public static string GetMACAddress1()
{
    ManagementObjectSearcher objMOS = new ManagementObjectSearcher("Select * FROM Win32_NetworkAdapterConfiguration");
    ManagementObjectCollection objMOC = objMOS.Get();
    string macAddress = String.Empty;
    foreach (ManagementObject objMO in objMOC)
    {
        object tempMacAddrObj = objMO["MacAddress"];

        if (tempMacAddrObj == null) //Skip objects without a MACAddress
        {
            continue;
        }
        if (macAddress == String.Empty) // only return MAC Address from first card that has a MAC Address
        {
            macAddress = tempMacAddrObj.ToString();              
        }
        objMO.Dispose();
    }
    macAddress = macAddress.Replace(":", "");
    return macAddress;
}

From System.Net namespace:

public static string GetMACAddress2()
{
    NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();
    String sMacAddress = string.Empty;
    foreach (NetworkInterface adapter in nics)
    {
        if (sMacAddress == String.Empty)// only return MAC Address from first card  
        {
            //IPInterfaceProperties properties = adapter.GetIPProperties(); Line is not required
            sMacAddress = adapter.GetPhysicalAddress().ToString();
        }
    } return sMacAddress;
}

Slightly modified from How to get the MAC address of system - C-Sharp Corner

C# get local MAC address by local IP (multiple interfaces)

Here is a proposed solution that does what you are asking for:

void Main()
{
    Console.WriteLine(GetMacByIP("192.168.15.161")); // will return "00-E2-4C-98-18-89"
}

public string GetMacByIP(string ipAddress)
{
    // grab all online interfaces
    var query = NetworkInterface.GetAllNetworkInterfaces()
        .Where(n =>
            n.OperationalStatus == OperationalStatus.Up && // only grabbing what's online
            n.NetworkInterfaceType != NetworkInterfaceType.Loopback)
        .Select(_ => new
        {
            PhysicalAddress = _.GetPhysicalAddress(),
            IPProperties = _.GetIPProperties(),
        });

    // grab the first interface that has a unicast address that matches your search string
    var mac = query
        .Where(q => q.IPProperties.UnicastAddresses
            .Any(ua => ua.Address.ToString() == ipAddress))
        .FirstOrDefault()
        .PhysicalAddress;

    // return the mac address with formatting (eg "00-00-00-00-00-00")
    return String.Join("-", mac.GetAddressBytes().Select(b => b.ToString("X2")));
}

In C# how to find the mac address of internal devices not the Router mac address

This method is the best way to get Mac address of your User.

[DllImport("Iphlpapi.dll")]
        private static extern int SendARP(Int32 dest, Int32 host, ref Int64 mac, ref Int32 length);
        [DllImport("Ws2_32.dll")]
        private static extern Int32 inet_addr(string ip);
        private static string GetClientMAC(string strClientIP)
        {
            string mac_dest = "";
            try
            {
                Int32 ldest = inet_addr(strClientIP);
                Int32 lhost = inet_addr("");
                Int64 macinfo = new Int64();
                Int32 len = 6;
                int res = SendARP(ldest, 0, ref macinfo, ref len);
                string mac_src = macinfo.ToString("X");

                while (mac_src.Length < 12)
                {
                    mac_src = mac_src.Insert(0, "0");
                }

                for (int i = 0; i < 11; i++)
                {
                    if (0 == (i % 2))
                    {
                        if (i == 10)
                        {
                            mac_dest = mac_dest.Insert(0, mac_src.Substring(i, 2));
                        }
                        else
                        {
                            mac_dest = "-" + mac_dest.Insert(0, mac_src.Substring(i, 2));
                        }
                    }
                }
            }
            catch (Exception err)
            {
                throw new Exception("Lỗi " + err.Message);
            }
            return mac_dest;
        }

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

As per Marco Mp's comment above, have used ARP tables. arp class

get MAC address of computer

When you disable your network adapter, you can't access it at all - it is as if it isn't installed, which is why you don't see a MAC address.

EDIT: Explanation:

A MAC address belongs to a network adapter. If you have 3 adapters you have 3 MAC addresses. If you have no adapters, you have no MAC address.

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