Dns.GetHostAddressesAsync Method (String)

.NET Framework (current version)

Returns the Internet Protocol (IP) addresses for the specified host as an asynchronous operation.

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

<HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading := True)>
Public Shared Function GetHostAddressesAsync (
	hostNameOrAddress As String
) As Task(Of IPAddress())


Type: System.String

The host name or IP address to resolve.

Return Value

Type: System.Threading.Tasks.Task(Of IPAddress())

Returns Task(Of TResult).

The task object representing the asynchronous operation. The Result property on the task object returns an array of type IPAddress that holds the IP addresses for the host that is specified by the hostNameOrAddress parameter.

Exception Condition

hostNameOrAddress is null.


The length of hostNameOrAddress is greater than 255 characters.


An error is encountered when resolving hostNameOrAddress.


hostNameOrAddress is an invalid IP address.

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

This method queries a DNS server for the IP addresses associated with a host name. If hostNameOrAddress is an IP address, this address is returned without querying the DNS server.

.NET Framework
Available since 4.5
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