C# 如何检查IP地址是否在特定子网内
我有一个格式为10.132.0.0/20的子网和一个来自ASP.Net请求对象的IP地址 是否有.NET framework函数来检查IP地址是否在给定子网内C# 如何检查IP地址是否在特定子网内,c#,ip-address,subnet,C#,Ip Address,Subnet,我有一个格式为10.132.0.0/20的子网和一个来自ASP.Net请求对象的IP地址 是否有.NET framework函数来检查IP地址是否在给定子网内 如果没有，怎么做？我想是位操作吧？位操作很有效。将IP填充到一个32位无符号整数中，对子网的地址执行相同的操作，&-使用0xffffff屏蔽这两个地址查看MSDN博客。它包含一个扩展方法（isnsamesubnet），应该可以满足您的需要以及其他一些优点 公共静态类IPAddressExtensions { 公共静态IPAddress G
如果没有，怎么做？我想是位操作吧？位操作很有效。将IP填充到一个32位无符号整数中，对子网的地址执行相同的操作，
&0xffffff屏蔽这两个地址查看MSDN博客。它包含一个扩展方法（isnsamesubnet
），应该可以满足您的需要以及其他一些优点
公共静态类IPAddressExtensions
{
公共静态IPAddress GetBroadcastAddress（此IPAddress地址，IPAddress子网掩码）
{
字节[]ipAdressBytes=地址。GetAddressBytes（）；
byte[]subnetMaskBytes=subnetMask.GetAddressBytes（）；
if（ipAdressBytes.Length！=subnetMaskBytes.Length）
抛出新ArgumentException（“IP地址和子网掩码的长度不匹配”）；
byte[]broadcastAddress=新字节[ipAdressBytes.Length]；
for（int i=0；i
解决方案是使用System.Net.IPAddress
将IP地址转换为字节，并对地址、子网和掩码八位字节执行逐位比较
二进制AND运算符&
在两个操作数中都存在一位时，会将其复制到结果中
守则：
using System.Net; // Used to access IPAddress
bool IsAddressOnSubnet(string address, string subnet, string mask)
{
try
{
IPAddress Address = IPAddress.Parse(address);
IPAddress Subnet = IPAddress.Parse(subnet);
IPAddress Mask = IPAddress.Parse(mask);
Byte[] addressOctets = Address.GetAddressBytes();
Byte[] subnetOctets = Mask.GetAddressBytes();
Byte[] networkOctets = Subnet.GetAddressBytes();
return
((networkOctets[0] & subnetOctets[0]) == (addressOctets[0] & subnetOctets[0])) &&
((networkOctets[1] & subnetOctets[1]) == (addressOctets[1] & subnetOctets[1])) &&
((networkOctets[2] & subnetOctets[2]) == (addressOctets[2] & subnetOctets[2])) &&
((networkOctets[3] & subnetOctets[3]) == (addressOctets[3] & subnetOctets[3]));
}
catch (System.Exception ex)
{
return false;
}
}
特别感谢
由于MSDN博客代码依赖于广播，而IPv6没有广播，我不知道它是否适用于IPv6
我最终采用了这些方法（多亏了珠穆朗玛峰）。您可以从CIDR符号（“1.2.3.4/5”）获取子网和掩码，并检查地址是否在此网络内
这适用于IPv4和IPv6：
public static class IpAddresses
{
public static Tuple<IPAddress, IPAddress> GetSubnetAndMaskFromCidr(string cidr)
{
var delimiterIndex = cidr.IndexOf('/');
string ipSubnet = cidr.Substring(0, delimiterIndex);
string mask = cidr.Substring(delimiterIndex + 1);
var subnetAddress = IPAddress.Parse(ipSubnet);
if (subnetAddress.AddressFamily == AddressFamily.InterNetworkV6)
{
// ipv6
var ip = BigInteger.Parse("00FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF", NumberStyles.HexNumber) << (128 - int.Parse(mask));
var maskBytes = new[]
{
(byte)((ip & BigInteger.Parse("00FF000000000000000000000000000000", NumberStyles.HexNumber)) >> 120),
(byte)((ip & BigInteger.Parse("0000FF0000000000000000000000000000", NumberStyles.HexNumber)) >> 112),
(byte)((ip & BigInteger.Parse("000000FF00000000000000000000000000", NumberStyles.HexNumber)) >> 104),
(byte)((ip & BigInteger.Parse("00000000FF000000000000000000000000", NumberStyles.HexNumber)) >> 96),
(byte)((ip & BigInteger.Parse("0000000000FF0000000000000000000000", NumberStyles.HexNumber)) >> 88),
(byte)((ip & BigInteger.Parse("000000000000FF00000000000000000000", NumberStyles.HexNumber)) >> 80),
(byte)((ip & BigInteger.Parse("00000000000000FF000000000000000000", NumberStyles.HexNumber)) >> 72),
(byte)((ip & BigInteger.Parse("0000000000000000FF0000000000000000", NumberStyles.HexNumber)) >> 64),
(byte)((ip & BigInteger.Parse("000000000000000000FF00000000000000", NumberStyles.HexNumber)) >> 56),
(byte)((ip & BigInteger.Parse("00000000000000000000FF000000000000", NumberStyles.HexNumber)) >> 48),
(byte)((ip & BigInteger.Parse("0000000000000000000000FF0000000000", NumberStyles.HexNumber)) >> 40),
(byte)((ip & BigInteger.Parse("000000000000000000000000FF00000000", NumberStyles.HexNumber)) >> 32),
(byte)((ip & BigInteger.Parse("00000000000000000000000000FF000000", NumberStyles.HexNumber)) >> 24),
(byte)((ip & BigInteger.Parse("0000000000000000000000000000FF0000", NumberStyles.HexNumber)) >> 16),
(byte)((ip & BigInteger.Parse("000000000000000000000000000000FF00", NumberStyles.HexNumber)) >> 8),
(byte)((ip & BigInteger.Parse("00000000000000000000000000000000FF", NumberStyles.HexNumber)) >> 0),
};
return Tuple.Create(subnetAddress, new IPAddress(maskBytes));
}
else
{
// ipv4
uint ip = 0xFFFFFFFF << (32 - int.Parse(mask));
var maskBytes = new[]
{
(byte)((ip & 0xFF000000) >> 24),
(byte)((ip & 0x00FF0000) >> 16),
(byte)((ip & 0x0000FF00) >> 8),
(byte)((ip & 0x000000FF) >> 0),
};
return Tuple.Create(subnetAddress, new IPAddress(maskBytes));
}
}
public static bool IsAddressOnSubnet(IPAddress address, IPAddress subnet, IPAddress mask)
{
byte[] addressOctets = address.GetAddressBytes();
byte[] subnetOctets = mask.GetAddressBytes();
byte[] networkOctets = subnet.GetAddressBytes();
// ensure that IPv4 isn't mixed with IPv6
if (addressOctets.Length != subnetOctets.Length
|| addressOctets.Length != networkOctets.Length)
{
return false;
}
for (int i = 0; i < addressOctets.Length; i += 1)
{
var addressOctet = addressOctets[i];
var subnetOctet = subnetOctets[i];
var networkOctet = networkOctets[i];
if (networkOctet != (addressOctet & subnetOctet))
{
return false;
}
}
return true;
}
}
我在这里参加聚会迟到了，但我也有类似的需要，所以我准备了一个快速的程序包来完成这项工作
资料来源：
简单使用：
using IpMatcher;
Matcher matcher = new Matcher();
matcher.Add("192.168.1.0", "255.255.255.0");
matcher.Add("192.168.2.0", "255.255.255.0");
matcher.Remove("192.168.2.0");
matcher.Exists("192.168.1.0", "255.255.255.0"); // true
matcher.Match("192.168.1.34"); // true
matcher.Match("10.10.10.10"); // false
使用这些答案，再加上我最终得到了一些适用于IPv4和IPv6的东西，如果您使用CIDR符号（IPAddress/PrefixLength）。我的IPv6实现可能有点过于直截了当，但由于没有UInt128数据类型，我无法适应Thomas的解决方案。下面是似乎运行良好的代码：
public static bool IsInSubnet(this IPAddress address, string subnetMask)
{
var slashIdx = subnetMask.IndexOf("/");
if (slashIdx == -1)
{ // We only handle netmasks in format "IP/PrefixLength".
throw new NotSupportedException("Only SubNetMasks with a given prefix length are supported.");
}
// First parse the address of the netmask before the prefix length.
var maskAddress = IPAddress.Parse(subnetMask.Substring(0, slashIdx));
if (maskAddress.AddressFamily != address.AddressFamily)
{ // We got something like an IPV4-Address for an IPv6-Mask. This is not valid.
return false;
}
// Now find out how long the prefix is.
int maskLength = int.Parse(subnetMask.Substring(slashIdx + 1));
if (maskAddress.AddressFamily == AddressFamily.InterNetwork)
{
// Convert the mask address to an unsigned integer.
var maskAddressBits = BitConverter.ToUInt32(maskAddress.GetAddressBytes().Reverse().ToArray(), 0);
// And convert the IpAddress to an unsigned integer.
var ipAddressBits = BitConverter.ToUInt32(address.GetAddressBytes().Reverse().ToArray(), 0);
// Get the mask/network address as unsigned integer.
uint mask = uint.MaxValue << (32 - maskLength);
// https://stackoverflow.com/a/1499284/3085985
// Bitwise AND mask and MaskAddress, this should be the same as mask and IpAddress
// as the end of the mask is 0000 which leads to both addresses to end with 0000
// and to start with the prefix.
return (maskAddressBits & mask) == (ipAddressBits & mask);
}
if (maskAddress.AddressFamily == AddressFamily.InterNetworkV6)
{
// Convert the mask address to a BitArray.
var maskAddressBits = new BitArray(maskAddress.GetAddressBytes());
// And convert the IpAddress to a BitArray.
var ipAddressBits = new BitArray(address.GetAddressBytes());
if (maskAddressBits.Length != ipAddressBits.Length)
{
throw new ArgumentException("Length of IP Address and Subnet Mask do not match.");
}
// Compare the prefix bits.
for (int maskIndex = 0; maskIndex < maskLength; maskIndex++)
{
if (ipAddressBits[maskIndex] != maskAddressBits[maskIndex])
{
return false;
}
}
return true;
}
throw new NotSupportedException("Only InterNetworkV6 or InterNetwork address families are supported.");
}
作为我使用和测试的基础
我希望有人觉得这有帮助；） 我还创建了一个类，用于计算网络和广播地址，并检查IP是否既不是广播地址也不是网络地址
private static IPValidationFailedReason PerformIPRangeValidation(string ipAddress, string subnetMask)
{
IPValidationFailedReason ipValidationType = IPValidationFailedReason.None;
string networkaddress = string.Empty;
string broadcastAddress = string.Empty;
string networkAddressBinary = string.Empty;
string broadcastAddressBinary = string.Empty;
int zerosCountInSubnetMask = 0;
Array.ForEach(subnetMask.Split(SplitterChar), (eachOctet) => Array.ForEach(IPInterfaceHelper.GetOctetWithPadding(eachOctet).Where(c => c == CharZero).ToArray(), (k) => zerosCountInSubnetMask++));
if (zerosCountInSubnetMask == 0)
{
return ipValidationType;
}
string ipAddressBinary = IPInterfaceHelper.ToBinary(ipAddress);
networkAddressBinary = GetNetworkAddressInBinaryFormat(zerosCountInSubnetMask, ipAddressBinary);
broadcastAddressBinary = GetBroadcastAddressInBinaryFormat(zerosCountInSubnetMask, ipAddressBinary);
networkaddress = ToIPFromBinary(networkAddressBinary);
broadcastAddress = ToIPFromBinary(broadcastAddressBinary);
if (ipAddress == networkaddress)
{
ipValidationType = IPValidationFailedReason.NetworkAddressZero;
return ipValidationType;
}
if (ipAddress == broadcastAddress)
{
ipValidationType = IPValidationFailedReason.BroadcastAddressNotPermiited;
return ipValidationType;
}
return ipValidationType;
}
private static string GetNetworkAddressInBinaryFormat(int zeroCountInSubnetMask, string ipAddressBinary)
{
string networkAddressBinary = string.Empty;
int countOfOnesInSubnetMask = TotalBitCount - zeroCountInSubnetMask;
StringBuilder sb = new StringBuilder(ipAddressBinary);
//When Subnet is like 255.255.255.0
if (zeroCountInSubnetMask >= 1 && zeroCountInSubnetMask <= 8)
{
networkAddressBinary = sb.Replace(CharOne, CharZero, countOfOnesInSubnetMask + 3, zeroCountInSubnetMask).ToString();
}
//When Subnet is like 255.255.0.0
if (zeroCountInSubnetMask > 8 && zeroCountInSubnetMask <= 16)
{
networkAddressBinary = sb.Replace(CharOne, CharZero, countOfOnesInSubnetMask + 2, zeroCountInSubnetMask + 1).ToString();
}
//When Subnet is like 255.0.0.0
if (zeroCountInSubnetMask > 16 && zeroCountInSubnetMask <= 24)
{
networkAddressBinary = sb.Replace(CharOne, CharZero, countOfOnesInSubnetMask + 1, zeroCountInSubnetMask + 2).ToString();
}
//When Subnet is like 128.0.0.0
if (zeroCountInSubnetMask > 24 && zeroCountInSubnetMask < 32)
{
networkAddressBinary = sb.Replace(CharOne, CharZero, countOfOnesInSubnetMask , zeroCountInSubnetMask + 3).ToString();
}
return networkAddressBinary;
}
private static string GetBroadcastAddressInBinaryFormat(int zeroCountInSubnetMask, string ipAddressBinary)
{
string broadcastAddressBinary = string.Empty;
int countOfOnesInSubnetMask = TotalBitCount - zeroCountInSubnetMask;
StringBuilder sb = new StringBuilder(ipAddressBinary);
//When Subnet is like 255.255.255.0
if (zeroCountInSubnetMask >= 1 && zeroCountInSubnetMask <= 8)
{
broadcastAddressBinary = sb.Replace(CharZero, CharOne, countOfOnesInSubnetMask + 3, zeroCountInSubnetMask).ToString();
}
//When Subnet is like 255.255.0.0
if (zeroCountInSubnetMask > 8 && zeroCountInSubnetMask <= 16)
{
broadcastAddressBinary = sb.Replace(CharZero, CharOne, countOfOnesInSubnetMask + 2, zeroCountInSubnetMask + 1).ToString();
}
//When Subnet is like 255.0.0.0
if (zeroCountInSubnetMask > 16 && zeroCountInSubnetMask <= 24)
{
broadcastAddressBinary = sb.Replace(CharZero, CharOne, countOfOnesInSubnetMask + 1, zeroCountInSubnetMask + 2).ToString();
}
//When Subnet is like 128.0.0.0
if (zeroCountInSubnetMask > 24 && zeroCountInSubnetMask < 32)
{
broadcastAddressBinary = sb.Replace(CharZero, CharOne, countOfOnesInSubnetMask , zeroCountInSubnetMask + 3).ToString();
}
return broadcastAddressBinary;
}
private static string ToIPFromBinary(string ipAddressBinary)
{
string addrTemp = string.Empty;
string[] networkAddressBinaryOctets = ipAddressBinary.Split(SplitterChar);
foreach (var eachOctet in networkAddressBinaryOctets)
{
string temp = Convert.ToUInt32(eachOctet, 2).ToString(CultureInfo.InvariantCulture);
addrTemp += temp + SplitterChar;
}
// remove last '.'
string ipAddress = addrTemp.Substring(0, addrTemp.Length - 1);
return ipAddress;
}
private static IPValidationFailedReason PerformIPRangeValidation（字符串ipAddress，字符串子网掩码）
{
IPValidationFailedReason ipValidationType=IPValidationFailedReason.None；
string networkaddress=string.Empty；
string broadcastAddress=string.Empty；
string networkAddressBinary=string.Empty；
string broadcastAddressBinary=string.Empty；
int Zero子网掩码=0；
ForEach（subnetMask.Split（SplitterChar），（eachOctet）=>Array.ForEach（IPInterfaceHelper.GetOctetWithPadding（eachOctet）.其中（c=>c==CharZero.ToArray（），（k=>zeroscontinSubnetmask++）；
如果（零子网掩码==0）
{
返回ipValidationType；
}
字符串ipAddressBinary=IPInterfaceHelper.ToBinary（ipAddress）；
networkAddressBinary=GetNetworkAddressInBinaryFormat（零子网掩码，ipAddressBinary）；
broadcastAddressBinary=GetBroadcastAddressInBinaryFormat（零子网掩码，ipAddressBinary）；
networkaddress=ToIPFromBinary（networkAddressBinary）；
broadcastAddress=ToIPFromBinary（broadcastAddressBinary）；
if（ipAddress==网络地址）
{
ipValidationType=IPValidationFailedReason.NetworkAddressZero；
返回ipValidationType；
}
if（ipAddress==广播地址）
{
ipValidationType=IPValidationFailedReason.BroadcastAddressNotPermited；
返回ipValidationType；
}
返回ipValidationType；
}
私有静态字符串GetNetworkAddressInBinaryFormat（int zeroCountInSubnetMask，字符串ipAddressBinary）
{
string networkAddressBinary=string.Empty；
int COUNTOOFONSINSUBNETSMASK=总比特计数-零计数INSUBNETSMASK；
StringBuilder sb=新的StringBuilder（ipAddressBinary）；
//当子网类似于255.255.255.0时
如果（zeroccountinsubnetmask>=1&&zeroccountinsubnetmask 8&&zeroccountinsubnetmask 16&&zeroccountinsubnetmask 24&&zeroccountinsubnetmask<32）
{
networkAddressBinary=sb.Replace（CharOne，CharZero，countofonesisunsbnetmask，zeroccountinsubnetmask+
public static bool IsInSubnet(this IPAddress address, string subnetMask)
{
var slashIdx = subnetMask.IndexOf("/");
if (slashIdx == -1)
{ // We only handle netmasks in format "IP/PrefixLength".
throw new NotSupportedException("Only SubNetMasks with a given prefix length are supported.");
}
// First parse the address of the netmask before the prefix length.
var maskAddress = IPAddress.Parse(subnetMask.Substring(0, slashIdx));
if (maskAddress.AddressFamily != address.AddressFamily)
{ // We got something like an IPV4-Address for an IPv6-Mask. This is not valid.
return false;
}
// Now find out how long the prefix is.
int maskLength = int.Parse(subnetMask.Substring(slashIdx + 1));
if (maskAddress.AddressFamily == AddressFamily.InterNetwork)
{
// Convert the mask address to an unsigned integer.
var maskAddressBits = BitConverter.ToUInt32(maskAddress.GetAddressBytes().Reverse().ToArray(), 0);
// And convert the IpAddress to an unsigned integer.
var ipAddressBits = BitConverter.ToUInt32(address.GetAddressBytes().Reverse().ToArray(), 0);
// Get the mask/network address as unsigned integer.
uint mask = uint.MaxValue << (32 - maskLength);
// https://stackoverflow.com/a/1499284/3085985
// Bitwise AND mask and MaskAddress, this should be the same as mask and IpAddress
// as the end of the mask is 0000 which leads to both addresses to end with 0000
// and to start with the prefix.
return (maskAddressBits & mask) == (ipAddressBits & mask);
}
if (maskAddress.AddressFamily == AddressFamily.InterNetworkV6)
{
// Convert the mask address to a BitArray.
var maskAddressBits = new BitArray(maskAddress.GetAddressBytes());
// And convert the IpAddress to a BitArray.
var ipAddressBits = new BitArray(address.GetAddressBytes());
if (maskAddressBits.Length != ipAddressBits.Length)
{
throw new ArgumentException("Length of IP Address and Subnet Mask do not match.");
}
// Compare the prefix bits.
for (int maskIndex = 0; maskIndex < maskLength; maskIndex++)
{
if (ipAddressBits[maskIndex] != maskAddressBits[maskIndex])
{
return false;
}
}
return true;
}
throw new NotSupportedException("Only InterNetworkV6 or InterNetwork address families are supported.");
}
public class IpAddressExtensionsTests
{
[Theory]
[InlineData("192.168.5.85/24", "192.168.5.1")]
[InlineData("192.168.5.85/24", "192.168.5.254")]
[InlineData("10.128.240.50/30", "10.128.240.48")]
[InlineData("10.128.240.50/30", "10.128.240.49")]
[InlineData("10.128.240.50/30", "10.128.240.50")]
[InlineData("10.128.240.50/30", "10.128.240.51")]
public void IpV4SubnetMaskMatchesValidIpAddress(string netMask, string ipAddress)
{
var ipAddressObj = IPAddress.Parse(ipAddress);
Assert.True(ipAddressObj.IsInSubnet(netMask));
}
[Theory]
[InlineData("192.168.5.85/24", "192.168.4.254")]
[InlineData("192.168.5.85/24", "191.168.5.254")]
[InlineData("10.128.240.50/30", "10.128.240.47")]
[InlineData("10.128.240.50/30", "10.128.240.52")]
[InlineData("10.128.240.50/30", "10.128.239.50")]
[InlineData("10.128.240.50/30", "10.127.240.51")]
public void IpV4SubnetMaskDoesNotMatchInvalidIpAddress(string netMask, string ipAddress)
{
var ipAddressObj = IPAddress.Parse(ipAddress);
Assert.False(ipAddressObj.IsInSubnet(netMask));
}
[Theory]
[InlineData("2001:db8:abcd:0012::0/64", "2001:0DB8:ABCD:0012:0000:0000:0000:0000")]
[InlineData("2001:db8:abcd:0012::0/64", "2001:0DB8:ABCD:0012:FFFF:FFFF:FFFF:FFFF")]
[InlineData("2001:db8:abcd:0012::0/64", "2001:0DB8:ABCD:0012:0001:0000:0000:0000")]
[InlineData("2001:db8:abcd:0012::0/64", "2001:0DB8:ABCD:0012:FFFF:FFFF:FFFF:FFF0")]
[InlineData("2001:db8:abcd:0012::0/128", "2001:0DB8:ABCD:0012:0000:0000:0000:0000")]
public void IpV6SubnetMaskMatchesValidIpAddress(string netMask, string ipAddress)
{
var ipAddressObj = IPAddress.Parse(ipAddress);
Assert.True(ipAddressObj.IsInSubnet(netMask));
}
[Theory]
[InlineData("2001:db8:abcd:0012::0/64", "2001:0DB8:ABCD:0011:FFFF:FFFF:FFFF:FFFF")]
[InlineData("2001:db8:abcd:0012::0/64", "2001:0DB8:ABCD:0013:0000:0000:0000:0000")]
[InlineData("2001:db8:abcd:0012::0/64", "2001:0DB8:ABCD:0013:0001:0000:0000:0000")]
[InlineData("2001:db8:abcd:0012::0/64", "2001:0DB8:ABCD:0011:FFFF:FFFF:FFFF:FFF0")]
[InlineData("2001:db8:abcd:0012::0/128", "2001:0DB8:ABCD:0012:0000:0000:0000:0001")]
public void IpV6SubnetMaskDoesNotMatchInvalidIpAddress(string netMask, string ipAddress)
{
var ipAddressObj = IPAddress.Parse(ipAddress);
Assert.False(ipAddressObj.IsInSubnet(netMask));
}
}
private static IPValidationFailedReason PerformIPRangeValidation(string ipAddress, string subnetMask)
{
IPValidationFailedReason ipValidationType = IPValidationFailedReason.None;
string networkaddress = string.Empty;
string broadcastAddress = string.Empty;
string networkAddressBinary = string.Empty;
string broadcastAddressBinary = string.Empty;
int zerosCountInSubnetMask = 0;
Array.ForEach(subnetMask.Split(SplitterChar), (eachOctet) => Array.ForEach(IPInterfaceHelper.GetOctetWithPadding(eachOctet).Where(c => c == CharZero).ToArray(), (k) => zerosCountInSubnetMask++));
if (zerosCountInSubnetMask == 0)
{
return ipValidationType;
}
string ipAddressBinary = IPInterfaceHelper.ToBinary(ipAddress);
networkAddressBinary = GetNetworkAddressInBinaryFormat(zerosCountInSubnetMask, ipAddressBinary);
broadcastAddressBinary = GetBroadcastAddressInBinaryFormat(zerosCountInSubnetMask, ipAddressBinary);
networkaddress = ToIPFromBinary(networkAddressBinary);
broadcastAddress = ToIPFromBinary(broadcastAddressBinary);
if (ipAddress == networkaddress)
{
ipValidationType = IPValidationFailedReason.NetworkAddressZero;
return ipValidationType;
}
if (ipAddress == broadcastAddress)
{
ipValidationType = IPValidationFailedReason.BroadcastAddressNotPermiited;
return ipValidationType;
}
return ipValidationType;
}
private static string GetNetworkAddressInBinaryFormat(int zeroCountInSubnetMask, string ipAddressBinary)
{
string networkAddressBinary = string.Empty;
int countOfOnesInSubnetMask = TotalBitCount - zeroCountInSubnetMask;
StringBuilder sb = new StringBuilder(ipAddressBinary);
//When Subnet is like 255.255.255.0
if (zeroCountInSubnetMask >= 1 && zeroCountInSubnetMask <= 8)
{
networkAddressBinary = sb.Replace(CharOne, CharZero, countOfOnesInSubnetMask + 3, zeroCountInSubnetMask).ToString();
}
//When Subnet is like 255.255.0.0
if (zeroCountInSubnetMask > 8 && zeroCountInSubnetMask <= 16)
{
networkAddressBinary = sb.Replace(CharOne, CharZero, countOfOnesInSubnetMask + 2, zeroCountInSubnetMask + 1).ToString();
}
//When Subnet is like 255.0.0.0
if (zeroCountInSubnetMask > 16 && zeroCountInSubnetMask <= 24)
{
networkAddressBinary = sb.Replace(CharOne, CharZero, countOfOnesInSubnetMask + 1, zeroCountInSubnetMask + 2).ToString();
}
//When Subnet is like 128.0.0.0
if (zeroCountInSubnetMask > 24 && zeroCountInSubnetMask < 32)
{
networkAddressBinary = sb.Replace(CharOne, CharZero, countOfOnesInSubnetMask , zeroCountInSubnetMask + 3).ToString();
}
return networkAddressBinary;
}
private static string GetBroadcastAddressInBinaryFormat(int zeroCountInSubnetMask, string ipAddressBinary)
{
string broadcastAddressBinary = string.Empty;
int countOfOnesInSubnetMask = TotalBitCount - zeroCountInSubnetMask;
StringBuilder sb = new StringBuilder(ipAddressBinary);
//When Subnet is like 255.255.255.0
if (zeroCountInSubnetMask >= 1 && zeroCountInSubnetMask <= 8)
{
broadcastAddressBinary = sb.Replace(CharZero, CharOne, countOfOnesInSubnetMask + 3, zeroCountInSubnetMask).ToString();
}
//When Subnet is like 255.255.0.0
if (zeroCountInSubnetMask > 8 && zeroCountInSubnetMask <= 16)
{
broadcastAddressBinary = sb.Replace(CharZero, CharOne, countOfOnesInSubnetMask + 2, zeroCountInSubnetMask + 1).ToString();
}
//When Subnet is like 255.0.0.0
if (zeroCountInSubnetMask > 16 && zeroCountInSubnetMask <= 24)
{
broadcastAddressBinary = sb.Replace(CharZero, CharOne, countOfOnesInSubnetMask + 1, zeroCountInSubnetMask + 2).ToString();
}
//When Subnet is like 128.0.0.0
if (zeroCountInSubnetMask > 24 && zeroCountInSubnetMask < 32)
{
broadcastAddressBinary = sb.Replace(CharZero, CharOne, countOfOnesInSubnetMask , zeroCountInSubnetMask + 3).ToString();
}
return broadcastAddressBinary;
}
private static string ToIPFromBinary(string ipAddressBinary)
{
string addrTemp = string.Empty;
string[] networkAddressBinaryOctets = ipAddressBinary.Split(SplitterChar);
foreach (var eachOctet in networkAddressBinaryOctets)
{
string temp = Convert.ToUInt32(eachOctet, 2).ToString(CultureInfo.InvariantCulture);
addrTemp += temp + SplitterChar;
}
// remove last '.'
string ipAddress = addrTemp.Substring(0, addrTemp.Length - 1);
return ipAddress;
}