IPAddress.Parse Method

Definition

Namespace:

System.Net

Assembly:

System.Net.Primitives.dll

Overloads

Parse(String)	Converts an IP address string to an IPAddress instance.
Parse(ReadOnlySpan<Char>)	Converts an IP address represented as a character span to an IPAddress instance.

Parse(String)

Source:

IPAddress.cs

Converts an IP address string to an IPAddress instance.

public:
 static System::Net::IPAddress ^ Parse(System::String ^ ipString);

public static System.Net.IPAddress Parse (string ipString);

static member Parse : string -> System.Net.IPAddress

Public Shared Function Parse (ipString As String) As IPAddress

Parameters

ipString

String

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

Returns

IPAddress

An IPAddress instance.

Exceptions

ArgumentNullException

ipString is null.

FormatException

ipString is not a valid IP address.

Examples

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

}

int main()
{
   array<String^>^args = Environment::GetCommandLineArgs();
   String^ IPaddress;
   if ( args->Length == 1 )
   {
      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 0;
   }
   else
      IPaddress = args[ 1 ];

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

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);
    }
   }
}

Imports System.Net



Class ParseAddress
   
   'Entry point which delegates to C-style main Private Function
   Public Overloads Shared Sub Main()
      Main(System.Environment.GetCommandLineArgs())
   End Sub
   
   
   Overloads Private Shared Sub Main(args() As String)
      Dim IPaddress As String
      
      If args.Length = 1 Then
         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(1)
      End If 
      ' Get the list of the IPv6 addresses associated with the requested host.
      Parse(IPaddress)
   End Sub
    
   
   ' This method calls the IPAddress.Parse method to check the ipAddress 
   ' input string. If the ipAddress argument represents a syntatical 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 Shared Sub Parse(ipAddr As String)
      Try
         ' Create an instance of IPAddress for the specified address string (in 
         ' dotted-quad, or colon-hexadecimal notation).
         Dim address As IPAddress = IPAddress.Parse(ipAddr)
         
         ' Display the address in standard notation.
         Console.WriteLine(("Parsing your input string: " + """" + ipAddr + """" + " produces this address (shown in its standard notation): " + address.ToString()))
      
      Catch e As ArgumentNullException
         Console.WriteLine("ArgumentNullException caught!!!")
         Console.WriteLine(("Source : " + e.Source))
         Console.WriteLine(("Message : " + e.Message))
      
      Catch e As FormatException
         Console.WriteLine("FormatException caught!!!")
         Console.WriteLine(("Source : " + e.Source))
         Console.WriteLine(("Message : " + e.Message))
      
      Catch e As Exception
         Console.WriteLine("Exception caught!!!")
         Console.WriteLine(("Source : " + e.Source))
         Console.WriteLine(("Message : " + e.Message))
      End Try
   End Sub
End Class

Remarks

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 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 -- "65535"	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 -- "1.1.1.10"	1.1.1.10
4 -- "1.1.1.010"	1.1.1.8
1 -- "0x2F"	0.0.0.47

Parse(ReadOnlySpan<Char>)

Source:

IPAddress.cs

Converts an IP address represented as a character span to an IPAddress instance.

public:
 static System::Net::IPAddress ^ Parse(ReadOnlySpan<char> ipSpan);

public static System.Net.IPAddress Parse (ReadOnlySpan<char> ipSpan);

static member Parse : ReadOnlySpan<char> -> System.Net.IPAddress

Public Shared Function Parse (ipSpan As ReadOnlySpan(Of Char)) As IPAddress

Parameters

ipSpan

ReadOnlySpan<Char>

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

Returns

IPAddress

The converted IP address.

Exceptions

FormatException

ipString is not a valid IP address.