Dns.GetHostEntry Method (IPAddress)

The GetHostEntry method queries a DNS server for the IP addresses and aliases associated with an IP address.

IPv6 addresses are filtered from the results of the GetHostEntry method if the local computer does not have IPv6 installed. As a result, it is possible to get back an empty IPHostEntry instance if only IPv6 results where available for the address parameter.

The Aliases property of the IPHostEntry instance returned is not populated by this method and will always be empty.

Note
This member emits trace information when you enable network tracing in your application. For more information, see Network Tracing.

The following code example uses the GetHostEntry method to resolve an IP address to an IPHostEntry instance.

public static void DoGetHostEntry(string hostname)
{
    IPHostEntry host;

    host = Dns.GetHostEntry(hostname);

    Console.WriteLine("GetHostEntry({0}) returns:", hostname);

    foreach (IPAddress ip in host.AddressList)
    {
        Console.WriteLine("    {0}", ip);
    }
}

.NET Framework

.NET Framework Client Profile

• DnsPermission 

  for accessing DNS information. Associated enumeration: PermissionState.Unrestricted

Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

Reference