public IPAddressFormat GetSubnet(IPAddressFormat ip, int cidr)
{
var ipAddress = new IPAddressFormat();
var bitDecimal = new byte[] { 0, 128, 192, 224, 240, 248, 252, 254, 255 };
if (cidr <= 8)
{
var first = bitDecimal[cidr];
ipAddress = new IPAddressFormat()
{
FirstOctet = first, SecondOctet = 0, ThirdOctet = 0, FourthOctet = 0
};
}
else if (cidr > 8 && cidr <= 16)
{
cidr = cidr - 8;
var second = bitDecimal[cidr];
ipAddress = new IPAddressFormat()
{
FirstOctet = 255, SecondOctet = second, ThirdOctet = 0, FourthOctet = 0
};
}
else if (cidr > 16 && cidr <= 24)
{
cidr = cidr - 16;
var third = bitDecimal[cidr];
ipAddress = new IPAddressFormat()
{
FirstOctet = 255, SecondOctet = 255, ThirdOctet = third, FourthOctet = 0
};
}
else if (cidr > 24 && cidr <= 32)
{
cidr = cidr - 24;
var fourth = bitDecimal[cidr];
ipAddress = new IPAddressFormat()
{
FirstOctet = 255, SecondOctet = 255, ThirdOctet = 255, FourthOctet = fourth
};
}
else
{
ipAddress = new IPAddressFormat()
{
FirstOctet = 0, SecondOctet = 0, ThirdOctet = 0, FourthOctet = 0
};
}
var sub = new IPAddressFormat()
{
FirstOctet = (byte)(ipAddress.FirstOctet & ip.FirstOctet),
SecondOctet = (byte)(ipAddress.SecondOctet & ip.SecondOctet),
ThirdOctet = (byte)(ipAddress.ThirdOctet & ip.ThirdOctet),
FourthOctet = (byte)(ipAddress.FourthOctet & ip.FourthOctet)
};
return(sub);
}
public IPAddressFormat Calculation(int a, int b, int c, int d, int cidr)
{
var initialIP = new IPAddressFormat()
{
FirstOctet = (byte)a, SecondOctet = (byte)b, ThirdOctet = (byte)c, FourthOctet = (byte)d
};
var value = _subnetMaskCalculator.GetSubnet(initialIP, cidr);
return(value);
}
