Dns.GetHostEntryAsync Method (IPAddress)

.NET Framework (current version)

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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)]
public static Task<IPHostEntry> GetHostEntryAsync(
	IPAddress address


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.

Exception Condition

address is null.


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.

.NET Framework
Available since 4.5
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