Как получить все ip адреса в локальной сети (особенно принтеров) - C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
using System.Collections;
using System.Runtime.InteropServices;
using System.Net;
 
namespace ServerEnum 
{
    internal class Class1 
    {
        [DllImport("netapi32.dll", EntryPoint="NetServerEnum")]
        public static extern NERR NetServerEnum([MarshalAs(UnmanagedType.LPWStr)] string ServerName, int Level, out IntPtr BufPtr, int PrefMaxLen, ref int EntriesRead, ref int TotalEntries, SV_101_TYPES ServerType, [MarshalAs(UnmanagedType.LPWStr)] string Domain, int ResumeHandle);
 
        [DllImport("netapi32.dll", EntryPoint="NetApiBufferFree")]
        public static extern NERR NetApiBufferFree(IntPtr Buffer);

        [Flags]
        public enum SV_101_TYPES : uint 
        {
            SV_TYPE_WORKSTATION = 0x00000001,
            SV_TYPE_SERVER = 0x00000002,
            SV_TYPE_SQLSERVER = 0x00000004,
            SV_TYPE_DOMAIN_CTRL = 0x00000008,
            SV_TYPE_DOMAIN_BAKCTRL = 0x00000010,
            SV_TYPE_TIME_SOURCE = 0x00000020,
            SV_TYPE_AFP = 0x00000040,
            SV_TYPE_NOVELL = 0x00000080,
            SV_TYPE_DOMAIN_MEMBER = 0x00000100,
            SV_TYPE_PRINTQ_SERVER = 0x00000200,
            SV_TYPE_DIALIN_SERVER = 0x00000400,
            SV_TYPE_XENIX_SERVER = 0x00000800,
            SV_TYPE_SERVER_UNIX = SV_TYPE_XENIX_SERVER,
            SV_TYPE_NT = 0x00001000,
            SV_TYPE_WFW = 0x00002000,
            SV_TYPE_SERVER_MFPN = 0x00004000,
            SV_TYPE_SERVER_NT = 0x00008000,
            SV_TYPE_POTENTIAL_BROWSER = 0x00010000,
            SV_TYPE_BACKUP_BROWSER = 0x00020000,
            SV_TYPE_MASTER_BROWSER = 0x00040000,
            SV_TYPE_DOMAIN_MASTER = 0x00080000,
            SV_TYPE_SERVER_OSF = 0x00100000,
            SV_TYPE_SERVER_VMS = 0x00200000,
            SV_TYPE_WINDOWS = 0x00400000,
            SV_TYPE_DFS = 0x00800000,
            SV_TYPE_CLUSTER_NT = 0x01000000,
            SV_TYPE_TERMINALSERVER = 0x02000000,
            SV_TYPE_CLUSTER_VS_NT = 0x04000000,
            SV_TYPE_DCE = 0x10000000,
            SV_TYPE_ALTERNATE_XPORT = 0x20000000,
            SV_TYPE_LOCAL_LIST_ONLY = 0x40000000,
            SV_TYPE_DOMAIN_ENUM = 0x80000000,
            SV_TYPE_ALL = 0xFFFFFFFF,
        }
 
        [StructLayout(LayoutKind.Sequential)]
        public struct SERVER_INFO_101 
        {
            [MarshalAs(UnmanagedType.U4)] public uint sv101_platform_id;
            [MarshalAs(UnmanagedType.LPWStr)] public string sv101_name;
            [MarshalAs(UnmanagedType.U4)] public uint sv101_version_major;
            [MarshalAs(UnmanagedType.U4)] public uint sv101_version_minor;
            [MarshalAs(UnmanagedType.U4)] public uint sv101_type;
            [MarshalAs(UnmanagedType.LPWStr)] public string sv101_comment;
        }

        public enum PLATFORM_ID : uint 
        {
            PLATFORM_ID_DOS = 300,
            PLATFORM_ID_OS2 = 400,
            PLATFORM_ID_NT = 500,
            PLATFORM_ID_OSF = 600,
            PLATFORM_ID_VMS = 700,
        }

        public enum NERR 
        {
            NERR_Success = 0, 
            ERROR_ACCESS_DENIED = 5,
            ERROR_NOT_ENOUGH_MEMORY = 8,
            ERROR_BAD_NETPATH = 53,
            ERROR_NETWORK_BUSY = 54,
            ERROR_INVALID_PARAMETER = 87,
            ERROR_INVALID_LEVEL = 124,
            ERROR_MORE_DATA = 234,
            ERROR_EXTENDED_ERROR = 1208,
            ERROR_NO_NETWORK = 1222,
            ERROR_INVALID_HANDLE_STATE = 1609,
            ERROR_NO_BROWSER_SERVERS_FOUND = 6118,
        }
 
        public static ArrayList GetServerList(SV_101_TYPES type) 
        {
            SERVER_INFO_101 si;
            IntPtr pInfo = IntPtr.Zero;
            int etriesread = 0;
            int totalentries = 0;
            ArrayList srvs = new ArrayList();
            srvs.Clear();
 
            try 
            {
                NERR err = NetServerEnum(null, 101, out pInfo, -1, ref etriesread, ref totalentries, type, null, 0);
                if ((err == NERR.NERR_Success || err == NERR.ERROR_MORE_DATA) && pInfo != IntPtr.Zero) 
                {
                    int ptr = pInfo.ToInt32();
                    for (int i = 0; i < etriesread; i++) 
                    {
                        si = (SERVER_INFO_101) Marshal.PtrToStructure(new IntPtr(ptr), typeof (SERVER_INFO_101));
                        srvs.Add(si.sv101_name);
                        ptr += Marshal.SizeOf(si);
                    }
                }
            } 
            catch (Exception) 
            { 
            } 
            finally 
            { 
                if (pInfo != IntPtr.Zero) 
                {
                    NetApiBufferFree(pInfo);
                }
            }
            return (srvs);
        }
 
        [STAThread]
        static void Main() 
        {
            Console.WriteLine("{0} WORKSTATION", new string('=', 10));

           ArrayList list = GetServerList(SV_101_TYPES.SV_TYPE_ALL);
 
            foreach (string name in list) 
            {
                Console.WriteLine(name);
                try
                {
                    IPHostEntry iphostentry = Dns.GetHostByName(name);
                    foreach (IPAddress ipaddress in iphostentry.AddressList)
                    {
                        Console.WriteLine("IP #" + ipaddress.ToString());
                    }

                }
                catch (Exception ex) 
                {
                    Console.WriteLine(ex.Message);
                }
  
            }
 
            list.Clear();
 
            Console.ReadLine();
        }
    }
}