Network_Tool/SubnetScanner/IsHostAlive.cs

using System.Net.NetworkInformation;

namespace IP_port_checker.SubnetScanner
{
    public class IsHostAlive
    {
        private static bool HostAliveCheck(string ip)
        {
            try
            {
                using (Ping ping = new Ping())
                {
                    PingReply pingReply = ping.Send(ip, 1000);
                    return pingReply.Status == IPStatus.Success;
                }
            }
            catch
            {
                return false;
            }
        }
        public static void ParralelScan(string network)
        {
            var tasks = new List<Task>();
            int alive = 0;

            for (int i = 0; i < 254; i++)
            {
                string ip = $"{network}.{i}";
                tasks.Add(Task.Run(() =>
                {
                    if (HostAliveCheck(ip))
                    {
                        Console.WriteLine($"Хост {ip} - в сети");
                        alive++;
                    }
                }));
            }
            Task.WaitAll(tasks.ToArray());
            Console.WriteLine($"Устройств в сети: {alive}");
        }
    }
}