IPAddressInformation.IsDnsEligible Property

Gets a Boolean value that indicates whether the Internet Protocol (IP) address is valid to appear in a Domain Name System (DNS) server database.

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

public abstract bool IsDnsEligible { get; }

Property Value

Type: System.Boolean
true if the address can appear in a DNS database; otherwise, false.

Addresses in the range to are not DNS eligible. These addresses are reserved for Automatic Private IP Addressing (APIPA).

The following code example displays the anycast addresses for the network interfaces on the local computer.

public static void DisplayAnycastAddresses()
    int count = 0;

    Console.WriteLine("Anycast Addresses");
    NetworkInterface[] adapters  = NetworkInterface.GetAllNetworkInterfaces();
    foreach (NetworkInterface adapter in adapters)
        IPInterfaceProperties adapterProperties = adapter.GetIPProperties();
        IPAddressInformationCollection anyCast = adapterProperties.AnycastAddresses;
        if (anyCast.Count >0)

            foreach (IPAddressInformation any in anyCast)
                Console.WriteLine("  Anycast Address .......................... : {0} {1} {2}", 
                    any.IsTransient ? "Transient" : "", 
                    any.IsDnsEligible ? "DNS Eligible" : ""
    if (count == 0)
        Console.WriteLine("  No anycast addressses were found.");

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, 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.

Was this page helpful?
(1500 characters remaining)
Thank you for your feedback
© 2014 Microsoft