IPAddressResolver Class
System.Net.IP
Assembly:
System.Net.Primitives.dll
Provides functionality for resolving IP addresses from host names and vice versa.
Methods
-
Resolves a host name to an array of IP addresses.
public static IPAddress[] ResolveHostByName(string hostName); -
Retrieves host information for the specified host name.
public static IPHostEntry GetHostEntry(string hostName); -
Retrieves host information for the specified IP address.
public static IPHostEntry GetHostByAddress(IPAddress address);
Remarks
The IPAddressResolver class is a crucial component for network programming in .NET, enabling your applications to interact with network resources using human-readable host names instead of raw IP addresses. It abstracts away the complexities of DNS (Domain Name System) lookups and other name resolution services.
This class is particularly useful when you need to:
- Connect to a remote server using its domain name (e.g.,
www.example.com). - Determine the IP addresses associated with a given host name.
- Find out the host name corresponding to a specific IP address.
Note that the underlying resolution mechanisms may vary depending on the operating system and network configuration. For asynchronous operations or more advanced control, consider using classes like Dns from the System.Net namespace.
Examples
Resolving a Host Name
The following example demonstrates how to resolve the IP addresses for a given host name.
using System;
using System.Net;
public class Example
{
public static void Main(string[] args)
{
string hostName = "www.microsoft.com";
try
{
IPAddress[] addresses = IPAddressResolver.ResolveHostByName(hostName);
Console.WriteLine($"IP addresses for {hostName}:");
foreach (IPAddress address in addresses)
{
Console.WriteLine($"- {address}");
}
}
catch (SocketException ex)
{
Console.WriteLine($"Error resolving host {hostName}: {ex.Message}");
}
}
}
Getting Host Entry by IP Address
This example shows how to retrieve detailed host information using an IP address.
using System;
using System.Net;
public class Example
{
public static void Main(string[] args)
{
IPAddress ipAddress = IPAddress.Parse("8.8.8.8"); // Example IP for Google DNS
try
{
IPHostEntry hostInfo = IPAddressResolver.GetHostByAddress(ipAddress);
Console.WriteLine($"Host Name for {ipAddress}: {hostInfo.HostName}");
Console.WriteLine("Aliases:");
foreach (string alias in hostInfo.Aliases)
{
Console.WriteLine($"- {alias}");
}
}
catch (SocketException ex)
{
Console.WriteLine($"Error resolving host by address {ipAddress}: {ex.Message}");
}
}
}