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IPAddress.Parse Method

Converts an IP address string to an IPAddress instance.

Namespace:  System.Net
Assembly:  System (in System.dll)

public static IPAddress Parse(
	string ipString
)

Parameters

ipString
Type: System.String

A string that contains an IP address in dotted-quad notation for IPv4 and in colon-hexadecimal notation for IPv6.

Return Value

Type: System.Net.IPAddress
An IPAddress instance.

ExceptionCondition
ArgumentNullException

ipString is null.

FormatException

ipString is not a valid IP address.

The static Parse method creates an IPAddress instance from an IP address expressed in dotted-quad notation for IPv4 and in colon-hexadecimal notation for IPv6.

The Parse method accepts octal, decimal, and hexadecimal number formats in the ipString parameter for an IPv4 address, even when mixed. The Parse method can't handle Unicode characters in the ipString parameter.

The number of parts (each part is separated by a period) in ipString determines how the IP address is constructed. A one part address is stored directly in the network address. A two part address, convenient for specifying a class A address, puts the leading part in the first byte and the trailing part in the right-most three bytes of the network address. A three part address, convenient for specifying a class B address, puts the first part in the first byte, the second part in the second byte, and the final part in the right-most two bytes of the network address. For example:

Number of parts and example ipString

IPv4 address for IPAddress

1 -- "65536"

0.0.255.255

2 -- "20.2"

20.0.0.2

2 -- "20.65535"

20.0.255.255

3 -- "128.1.2"

128.1.0.2

4 -- "0xC0.0xA8.0x1.0x01"

192.168.1.1

4 -- "0300.0250.01.01"

192.168.1.1

4 -- "0300.0xA8.1.1"

192.168.1.1

The following code converts a string that contains an IP address, in dotted-quad notation for IPv4 or in colon-hexadecimal notation for IPv6, into an instance of the IPAddress class. Then it uses the overloaded ToString method to display the address in standard notation.

using System;
using System.Net;

class ParseAddress
{

  private static void Main(string[] args) 
  {
    string IPaddress;

    if (args.Length == 0)
    {
      Console.WriteLine("Please enter an IP address.");
      Console.WriteLine("Usage:   >cs_parse any IPv4 or IPv6 address.");
      Console.WriteLine("Example: >cs_parse 127.0.0.1");
      Console.WriteLine("Example: >cs_parse 0:0:0:0:0:0:0:1");
      return;
    }
    else
      IPaddress = args[0];

    // Get the list of the IPv6 addresses associated with the requested host.
    parse(IPaddress);

  }

  // This method calls the IPAddress.Parse method to check the ipAddress  
  // input string. If the ipAddress argument represents a syntatically correct IPv4 or 
  // IPv6 address, the method displays the Parse output into quad-notation or 
  // colon-hexadecimal notation, respectively. Otherwise, it displays an  
  // error message. 
  private static void parse(string ipAddress)
  {
    try
    {
      // Create an instance of IPAddress for the specified address string (in  
      // dotted-quad, or colon-hexadecimal notation).
      IPAddress address = IPAddress.Parse(ipAddress);

      // Display the address in standard notation.
      Console.WriteLine("Parsing your input string: " + "\"" + ipAddress + "\"" + " produces this address (shown in its standard notation): "+ address.ToString());
    }

    catch(ArgumentNullException e)
    {
      Console.WriteLine("ArgumentNullException caught!!!");
      Console.WriteLine("Source : " + e.Source);
      Console.WriteLine("Message : " + e.Message);
    }

    catch(FormatException e)
    {
      Console.WriteLine("FormatException caught!!!");
      Console.WriteLine("Source : " + e.Source);
      Console.WriteLine("Message : " + e.Message);
    }

    catch(Exception e)
    {
      Console.WriteLine("Exception caught!!!");
      Console.WriteLine("Source : " + e.Source);
      Console.WriteLine("Message : " + e.Message);
    }

   }
}
#using <mscorlib.dll>
#using <System.dll>
using namespace System;
using namespace System::Net;


// This method calls the IPAddress::Parse method to check the ipAddress
// input string. If the ipAddress argument represents a syntatically correct IPv4 or
// IPv6 address, the method displays the Parse output into quad-notation or
// colon-hexadecimal notation, respectively. Otherwise, it displays an
// error message.
void parse(String* ipAddress) {
   try {
      // Create an instance of IPAddress for the specified address string (in
      // dotted-quad, or colon-hexadecimal notation).
      IPAddress* address = IPAddress::Parse(ipAddress);

      // Display the address in standard notation.
      Console::WriteLine(S"Parsing your input string: \"{0}\" produces this address (shown in its standard notation): {1}", ipAddress, address);
   } catch (ArgumentNullException* e) {
      Console::WriteLine(S"ArgumentNullException caught!!!");
      Console::WriteLine(S"Source : {0}", e->Source);
      Console::WriteLine(S"Message : {0}", e->Message);
   } catch (FormatException* e) {
      Console::WriteLine(S"FormatException caught!!!");
      Console::WriteLine(S"Source : {0}", e->Source);
      Console::WriteLine(S"Message : {0}", e->Message);
   } catch (Exception* e) {
      Console::WriteLine(S"Exception caught!!!");
      Console::WriteLine(S"Source : {0}", e->Source);
      Console::WriteLine(S"Message : {0}", e->Message);
   }
}

int main() {
   String* args[] = Environment::GetCommandLineArgs();
   String* IPaddress;

   if (args->Length == 1) {
      Console::WriteLine(S"Please enter an IP address.");
      Console::WriteLine(S"Usage:   >cs_parse any IPv4 or IPv6 address.");
      Console::WriteLine(S"Example: >cs_parse 127.0.0.1");
      Console::WriteLine(S"Example: >cs_parse 0:0:0:0:0:0:0:1");
      return 0;
   } else
      IPaddress = args[1];
   // Get the list of the IPv6 addresses associated with the requested host.
   parse(IPaddress);
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0
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