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IPGlobalProperties.BeginGetUnicastAddresses Method

Begins an asynchronous request to retrieve the stable unicast IP address table on the local computer.

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

public virtual IAsyncResult BeginGetUnicastAddresses(
	AsyncCallback callback,
	Object state


Type: System.AsyncCallback
The System.AsyncCallback delegate.
Type: System.Object
An object that contains state information for this request.

Return Value

Type: System.IAsyncResult
An System.IAsyncResult that references the asynchronous request.


This method is not implemented on the platform. This method uses the native NotifyStableUnicastIpAddressTable function that is supported on Windows Vista and later.


The call to the native NotifyStableUnicastIpAddressTable function failed.

In order to support outbound connections or to accept incoming connections on a Teredo interface, applications need to ensure that the Teredo interface is up and ready for use. This is because Teredo can go into a dormant state when not used for some period of time.

The BeginGetUnicastAddresses method allows an application to asynchronously retrieve the list of stable unicast IP addresses. The IPAddress.IsIPv6Teredo property can be used to determine if an IP address is an IPv6 Teredo address with the prefix of 2001::/32.

The BeginGetUnicastAddresses method also returns non-Teredo addresses and provides a more convenient way to obtain the unicast IP addresses for a system than enumerating all the System.Net.NetworkInformation.NetworkInterface objects on a local computer and querying the associated IP addresses.

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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