gistfile1.cs

        static uint GetValue(uint value, int bitsToGrab, int bitsToMoveOver)
        {
            const uint FullMask = 0xFFFFFFFF;
            value = (uint)IPAddress.HostToNetworkOrder((int)value);
            var mask = FullMask << (bitsToGrab + bitsToMoveOver);
            value = (value << bitsToMoveOver);
            value = value & mask;
            value = value >> bitsToGrab;
            return value;
        }