Export (0) Print
Expand All
1 out of 19 rated this helpful - Rate this topic

IPAddress Class

Provides an Internet Protocol (IP) address.

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

'Declaration
<SerializableAttribute> _
Public Class IPAddress
'Usage
Dim instance As IPAddress

/** @attribute SerializableAttribute() */ 
public class IPAddress
SerializableAttribute 
public class IPAddress

The IPAddress class contains the address of a computer on an IP network.

The following code example shows how to query a server to obtain the family addresses and the IP addresses it supports.

' This program shows how to use the IPAddress class to obtain a server 
' IP addressess and related information.
Imports System
Imports System.Net
Imports System.Net.Sockets
Imports System.Text.RegularExpressions
Imports Microsoft.VisualBasic


Namespace Mssc.Services.ConnectionManagement
  Module M_TestIPAddress

    Class TestIPAddress

      'The IPAddresses method obtains the selected server IP address information.
      'It then displays the type of address family supported by the server and 
      'its IP address in standard and byte format.
      Private Shared Sub IPAddresses(ByVal server As String)
        Try
          Dim ASCII As New System.Text.ASCIIEncoding()

          ' Get server related information.
          Dim heserver As IPHostEntry = Dns.Resolve(server)

          ' Loop on the AddressList
          Dim curAdd As IPAddress
          For Each curAdd In heserver.AddressList

            ' Display the type of address family supported by the server. If the
            ' server is IPv6-enabled this value is: InternNetworkV6. If the server
            ' is also IPv4-enabled there will be an additional value of InterNetwork.
            Console.WriteLine(("AddressFamily: " + curAdd.AddressFamily.ToString()))

            ' Display the ScopeId property in case of IPV6 addresses.
            If curAdd.AddressFamily.ToString() = ProtocolFamily.InterNetworkV6.ToString() Then
              Console.WriteLine(("Scope Id: " + curAdd.ScopeId.ToString()))
            End If

            ' Display the server IP address in the standard format. In 
            ' IPv4 the format will be dotted-quad notation, in IPv6 it will be
            ' in in colon-hexadecimal notation.
            Console.WriteLine(("Address: " + curAdd.ToString()))

            ' Display the server IP address in byte format.
            Console.Write("AddressBytes: ")



            Dim bytes As [Byte]() = curAdd.GetAddressBytes()
            Dim i As Integer
            For i = 0 To bytes.Length - 1
              Console.Write(bytes(i))
            Next i
            Console.WriteLine(ControlChars.Cr + ControlChars.Lf)
          Next curAdd 

        Catch e As Exception
          Console.WriteLine(("[DoResolve] Exception: " + e.ToString()))
        End Try
      End Sub 'IPAddresses


      ' This IPAddressAdditionalInfo displays additional server address information.
      Private Shared Sub IPAddressAdditionalInfo()
        Try
          ' Display the flags that show if the server supports IPv4 or IPv6
          ' address schemas.
          Console.WriteLine((ControlChars.Cr + ControlChars.Lf + "SupportsIPv4: " + Socket.SupportsIPv4.ToString()))
          Console.WriteLine(("SupportsIPv6: " + Socket.SupportsIPv6.ToString()))

          If Socket.SupportsIPv6 Then
            ' Display the server Any address. This IP address indicates that the server 
            ' should listen for client activity on all network interfaces. 
            Console.WriteLine((ControlChars.Cr + ControlChars.Lf + "IPv6Any: " + IPAddress.IPv6Any.ToString()))

            ' Display the server loopback address. 
            Console.WriteLine(("IPv6Loopback: " + IPAddress.IPv6Loopback.ToString()))

            ' Used during autoconfiguration first phase.
            Console.WriteLine(("IPv6None: " + IPAddress.IPv6None.ToString()))

            Console.WriteLine(("IsLoopback(IPv6Loopback): " + IPAddress.IsLoopback(IPAddress.IPv6Loopback).ToString()))
          End If
          Console.WriteLine(("IsLoopback(Loopback): " + IPAddress.IsLoopback(IPAddress.Loopback).ToString()))
        Catch e As Exception
          Console.WriteLine(("[IPAddresses] Exception: " + e.ToString()))
        End Try
      End Sub 'IPAddressAdditionalInfo

      Public Shared Sub Main(ByVal args() As String)
        Dim server As String = Nothing

        ' Define a regular expression to parse user's input.
        ' This is a security check. It allows only
        ' alphanumeric input string between 2 to 40 character long.
        'Define a regular expression to parse user's input.
        'This is a security check. It allows only
        'alphanumeric input string between 2 to 40 character long.
        Dim rex As New Regex("^[a-zA-Z]\w{1,39}$")

        If args.Length < 1 Then
          ' If no server name is passed as an argument to this program, use the current 
          ' server name as default.
          server = Dns.GetHostName()
          Console.WriteLine(("Using current host: " + server))
        Else
          server = args(0)
          If Not rex.Match(server).Success Then
            Console.WriteLine("Input string format not allowed.")
            Return
          End If
        End If

        ' Get the list of the addresses associated with the requested server.
        IPAddresses(server)

        ' Get additonal address information.
        IPAddressAdditionalInfo()
      End Sub 'Main
    End Class 'TestIPAddress
  End Module
End Namespace

// This program shows how to use the IPAddress class to obtain a server 
// IP addressess and related information.
import System.*;
import System.Net.*;
import System.Net.Sockets.*;
import System.Text.RegularExpressions.*;

class TestIPAddress
{
    /**
       The IPAddresses method obtains the selected server IP address 
       information.It then displays the type of address family supported by 
       the server and its IP address in standard and byte format.
     */
    private static void IPAddresses(String server)
    {
        try {
            System.Text.ASCIIEncoding ascii = new System.Text.ASCIIEncoding();

            // Get server related information.
            IPHostEntry heserver = Dns.Resolve(server);
            // Loop on the AddressList
            for (int iCtr = 0; iCtr < heserver.get_AddressList().length;
                iCtr++) {            
                IPAddress curAdd = heserver.get_AddressList()[iCtr];

                // Display the type of address family supported by the server. 
                // If the server is IPv6-enabled this value is:InternNetworkV6.
                // If the server is also IPv4-enabled there will be an 
                // additional value of InterNetwork.
                Console.WriteLine(("AddressFamily: " 
                    + curAdd.get_AddressFamily().ToString()));

                // Display the ScopeId property in case of IPV6 addresses.
                if (curAdd.get_AddressFamily().ToString().equals(
                        ProtocolFamily.InterNetworkV6.ToString())) {
                    Console.WriteLine(("Scope Id: " 
                        +(new Long(curAdd.get_ScopeId())).ToString()));
                }

                // Display the server IP address in the standard format. In 
                // IPv4 the format will be dotted-quad notation, in IPv6 
                // it will be in in colon-hexadecimal notation.
                Console.WriteLine(("Address: " + curAdd.ToString()));
                // Display the server IP address in byte format.
                Console.Write("AddressBytes: ");

                ubyte bytes[] = curAdd.GetAddressBytes();
                for (int i = 0; i < bytes.length; i++) {
                    Console.Write(bytes[i]);
                }
                Console.WriteLine("\r\n");
            }
        }
        catch (System.Exception e) {
            Console.WriteLine(("[DoResolve] Exception: " + e.ToString()));
        }    
    } //IPAddresses

    // This IPAddressAdditionalInfo displays additional server address 
    // information.
    private static void IPAddressAdditionalInfo()
    {
        try {
            // Display the flags that show if the server supports IPv4 or IPv6
            // address schemas.
            Console.WriteLine("\r\nSupportsIPv4: " 
                + System.Convert.ToString(Socket.get_SupportsIPv4()));
            Console.WriteLine("SupportsIPv6: " 
                + System.Convert.ToString(Socket.get_SupportsIPv6()));
            if (Socket.get_SupportsIPv6()) {
                // Display the server Any address. This IP address indicates 
                // that the server should listen for client activity on all 
                // network interfaces. 
                Console.WriteLine(("\r\nIPv6Any: " 
                    + (IPAddress.IPv6Any).ToString()));

                // Display the server loopback address. 
                Console.WriteLine(("IPv6Loopback: "
                    + (IPAddress.IPv6Loopback).ToString()));

                // Used during autoconfiguration first phase.
                Console.WriteLine(("IPv6None: " 
                    + (IPAddress.IPv6None).ToString()));
                Console.WriteLine(("IsLoopback(IPv6Loopback): " 
                    + IPAddress.IsLoopback(IPAddress.IPv6Loopback)));
            }
            Console.WriteLine(("IsLoopback(Loopback): " 
                + System.Convert.ToString(IPAddress.
                IsLoopback(IPAddress.Loopback))));
        }
        catch (System.Exception e) {
            Console.WriteLine(("[IPAddresses] Exception: " + e.ToString()));
        } 
    } //IPAddressAdditionalInfo

    public static void main(String[] args)
    {
        String server = null;
        // Define a regular expression to parse user's input.
        // This is a security check. It allows only
        // alphanumeric input string between 2 to 40 character long.
        Regex rex = new Regex("^[a-zA-Z]\\w{1,39}$");
        if (args.length < 1) {
            // If no server name is passed as an argument to this program, 
            // use the current server name as default.
            server = Dns.GetHostName();
            Console.WriteLine(("Using current host: " + server));
        } 
        else {
            server = args[0];
            if (!(rex.Match(server).get_Success())) {
                Console.WriteLine("Input string format not allowed.");
                return;
            } 
        } 
        // Get the list of the addresses associated with the requested server.
        IPAddresses(server);

        // Get additonal address information.
        IPAddressAdditionalInfo();
    } //main
} //TestIPAddress

System.Object
  System.Net.IPAddress
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0
Did you find this helpful?
(1500 characters remaining)
Thank you for your feedback

Community Additions

ADD
Show:
© 2014 Microsoft. All rights reserved.