using System.Net;
// ...

// Using the IPAddess extension
IPAddress.Broadcast.SendWol(0x00, 0x11, 0x22, 0x33, 0x44, 0x55);

// via core MagicPacket class
var endPoint = new IPEndPoint(IPAddress.Broadcast, 7); // You don't have to use Broadcast.
                                                       // Every IP/port-combination is possible.
MagicPacket.Send(endPoint, 0x00, 0x11, 0x22, 0x33, 0x44, 0x55);

// via IPEndPoint extension
endPoint.SendWol(0x00, 0x11, 0x22, 0x33, 0x44, 0x55);

// ...
using System.Net.NetworkInformation;
PhysicalAddress.Parse("00-11-22-33-44-55").SendWol();

using System.Net;
using System.Net.Topology;
// ...

var someIp = new IPAddress(new byte[] { 192, 168, 1, 23 }); // Some IP address in the subnet
var mask = new NetMask(255, 255, 255, 0); // the network mask of the subnet

// CIDR-notation number of the network mask
int cidr = mask.Cidr;

var networkPrefix = someIp & mask; // bitwise operation to get the network address (192.168.1.0)
networkPrefix = someIp.GetNetworkPrefix(mask); // using the extension method for IPAddress

// retrieve broadcast address of the subnet (192.168.1.255)
var broadcastAddress = someIp.GetBroadcastAddress(mask);

IEnumerable<IPAddress> siblings = someIp.GetSiblings(mask, SiblingOptions.ExcludeUnusable);
// Enumerate through all IP addresses in the subnet, except network prefix and broadcast (RFC 950, 2^n-2)
foreach (IPAddress someIpInNetwork in siblings)
{
    Console.WriteLine(someIpInNetwork.ToString());
}

// Get number of possible siblings without someIp, broadcast and network prefix
int siblingCount = mask.GetSiblingCount(SiblingOptions.ExcludeAll);

ArpRequestResult res = ArpRequest.Send(someIp);
if(res.Exception != null)
{
    Console.WriteLine("ARP error occurred: " + res.Exception.Message);
}
else
{
    Console.WriteLine($"Host MAC address: {res.Address}");
}

await IPAddress.Broadcast.SendWolAsync(0x00, 0x11, 0x22, 0x33, 0x44, 0x55);

var mac = new PhysicalAddress(new byte[] {0x00, 0x11, 0x22, 0x33, 0x44, 0x55});
mac.SendWol(); // via extension method