Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
Export (0) Print
Expand All

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: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
© 2015 Microsoft