IPAddressHelper

1.0.1

Helpers/IPv6AddressHelper.cs

                                using System.Net;

using System;

namespace GreyCorbel.Helpers

{

public static class IPv6AddressHelper

    {

        public static System.Numerics.BigInteger GetNumber(IPAddress addr)

        {

            var arr = addr.GetAddressBytes();

            System.Array.Reverse(arr);

            return new System.Numerics.BigInteger(arr);

        }

        public static System.Numerics.BigInteger GetNumber(string ipAddress)

        {

            var parts = ipAddress.Split('/');

            var addr = System.Net.IPAddress.Parse(parts[0]);

            var arr = addr.GetAddressBytes();

            System.Array.Reverse(arr);

            return new System.Numerics.BigInteger(arr);

        }

        public static (System.Numerics.BigInteger,System.Numerics.BigInteger) GetRangeBoundaries(string range)

        {

            var parts = range.Split('/');

            if (parts.Length != 2)

                throw new ArgumentException("Invalid format of ipv6Range");

            var low = GetNumber(parts[0]);

            int maskNumber = int.Parse(parts[1]);

            System.Numerics.BigInteger rangeSize = (System.Numerics.BigInteger)1 << (128-maskNumber);

            System.Numerics.BigInteger high = low + rangeSize;

            return (low, high);

        }

        public static bool BelongsToRange(string ipAddress, string range)

        {

            var bounds = GetRangeBoundaries(range);

            var number = GetNumber(ipAddress);

            return number >=bounds.Item1 && number <= bounds.Item2;

        }

    }

}