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GetHostEntryAsync Method (IPAddress)
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Dns.GetHostEntryAsync Method (IPAddress)

.NET Framework 4.6 and 4.5

Resolves an IP address to an IPHostEntry instance as an asynchronous operation.

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

[<HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading = true)>]
static member GetHostEntryAsync : 
        address:IPAddress -> Task<IPHostEntry> 


Type: System.Net.IPAddress

An IP address.

Return Value

Type: System.Threading.Tasks.Task(IPHostEntry)
Returns Task(TResult).
The task object representing the asynchronous operation. The Result property on the task object returns an IPHostEntry instance that contains address information about the host specified in address.


address is a null reference (Nothing in Visual Basic).


An error is encountered when resolving address.


address is an invalid IP address.

This operation will not block. The returned Task(TResult) object will complete after the address has been resolved.

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

IPv6 addresses are filtered from the results of this 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.


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


The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: ExternalThreading. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.

.NET Framework

Supported in: 4.6, 4.5
© 2015 Microsoft