IPAddressInformation.IsDnsEligible Property


The .NET API Reference documentation has a new home. Visit the .NET API Browser on docs.microsoft.com to see the new experience.

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
Available since 2.0
Return to top