Get Available Socket Port

using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Net;
using System.Net.NetworkInformation;

namespace Salient.Net
{
    public static class IPUtility
    {
        [SuppressMessage("Microsoft.Maintainability", "CA1502:AvoidExcessiveComplexity")]
        public static ushort GetAvailablePort(UInt16 rangeStart, UInt16 rangeEnd, IPAddress ip, bool includeIdlePorts)
        {
            IPGlobalProperties ipProps = IPGlobalProperties.GetIPGlobalProperties();



            Func<IPAddress, bool> isIpAnyOrLoopBack = i => IPAddress.Any.Equals(i) ||
                                                           IPAddress.IPv6Any.Equals(i) ||
                                                           IPAddress.Loopback.Equals(i) ||
                                                           IPAddress.IPv6Loopback.
                                                               Equals(i);


            List<ushort> excludedPorts = new List<ushort>();




            excludedPorts.AddRange(from n in ipProps.GetActiveTcpConnections()
                                   where
                                       n.LocalEndPoint.Port >= rangeStart
                                       && n.LocalEndPoint.Port <= rangeEnd
                                       &&
                                       (isIpAnyOrLoopBack(ip) || n.LocalEndPoint.Address.Equals(ip) ||
                                        isIpAnyOrLoopBack(n.LocalEndPoint.Address))
                                       && (!includeIdlePorts || n.State != TcpState.TimeWait)
                                   select (ushort) n.LocalEndPoint.Port);

            excludedPorts.AddRange(from n in ipProps.GetActiveTcpListeners()
                                   where n.Port >= rangeStart && n.Port <= rangeEnd
                                         &&
                                         (isIpAnyOrLoopBack(ip) || n.Address.Equals(ip) || isIpAnyOrLoopBack(n.Address))
                                   select (ushort) n.Port);

            excludedPorts.AddRange(from n in ipProps.GetActiveUdpListeners()
                                   where n.Port >= rangeStart && n.Port <= rangeEnd
                                         &&
                                         (isIpAnyOrLoopBack(ip) || n.Address.Equals(ip) || isIpAnyOrLoopBack(n.Address))
                                   select (ushort) n.Port);

            excludedPorts.Sort();


            for (ushort port = rangeStart; port <= rangeEnd; port++)
            {
                if (!excludedPorts.Contains(port))
                {
                    return port;
                }
            }

            return 0;
        }

        public static NetworkInterface[] GetActiveNetworkInterfaces()
        {
            return
                (NetworkInterface.GetAllNetworkInterfaces().Where(p => p.OperationalStatus == OperationalStatus.Up)).
                    ToArray();
        }
    }
}