DescribeHosts - Amazon Elastic Compute Cloud
Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China (PDF).


Describes the specified Dedicated Hosts or all your Dedicated Hosts.

The results describe only the Dedicated Hosts in the Region you're currently using. All listed instances consume capacity on your Dedicated Host. Dedicated Hosts that have recently been released are listed with the state released.

Request Parameters

The following parameters are for this specific action. For more information about required and optional parameters that are common to all actions, see Common Query Parameters.


The filters.

  • auto-placement - Whether auto-placement is enabled or disabled (on | off).

  • availability-zone - The Availability Zone of the host.

  • client-token - The idempotency token that you provided when you allocated the host.

  • host-reservation-id - The ID of the reservation assigned to this host.

  • instance-type - The instance type size that the Dedicated Host is configured to support.

  • state - The allocation state of the Dedicated Host (available | under-assessment | permanent-failure | released | released-permanent-failure).

  • tag-key - The key of a tag assigned to the resource. Use this filter to find all resources assigned a tag with a specific key, regardless of the tag value.

Type: Array of Filter objects

Required: No


The IDs of the Dedicated Hosts. The IDs are used for targeted instance launches.

Type: Array of strings

Required: No


The maximum number of results to return for the request in a single page. The remaining results can be seen by sending another request with the returned nextToken value. This value can be between 5 and 500. If maxResults is given a larger value than 500, you receive an error.

You cannot specify this parameter and the host IDs parameter in the same request.

Type: Integer

Required: No


The token to use to retrieve the next page of results.

Type: String

Required: No

Response Elements

The following elements are returned by the service.


Information about the Dedicated Hosts.

Type: Array of Host objects


The token to use to retrieve the next page of results. This value is null when there are no more results to return.

Type: String


The ID of the request.

Type: String


For information about the errors that are common to all actions, see Common client error codes.


Example 1

This example describes the Dedicated Hosts in your account.

Sample Request &AUTHPARAMS

Sample Response

<DescribeHostsResponse xmlns=""> <requestId>d4904fd9-82c2-4ea5-adfe-a9cc3EXAMPLE</requestId> <hostSet> <item> <availableCapacity> <availableVCpus>96</availableVCpus> <availableInstanceCapacity> <item> <availableCapacity>48</availableCapacity> <totalCapacity>48</totalCapacity> <instanceType>m5.large</instanceType> </item> </availableInstanceCapacity> </availableCapacity> <instances/> <autoPlacement>off</autoPlacement> <hostRecovery>off</hostRecovery> <hostId>h-05abcdd96ee9ca123</hostId> <allocationTime>2018-01-23T12:33:31.692Z</allocationTime> <state>available</state> <hostProperties> <totalVCpus>96</totalVCpus> <cores>48</cores> <sockets>2</sockets> <instanceType>m5.large</instanceType> </hostProperties> <availabilityZone>us-east-1a</availabilityZone> </item> </hostSet> </DescribeHostsResponse>

Example 2

This example describes a released Dedicated Host in your account using the state filter to show only hosts with a state of released.

Sample Request &Filter.1.Name=state &Filter.1.Value=released &AUTHPARAMS

Sample Response

<DescribeHostsResponse xmlns=""> <requestId>d4904fd9-82c2-4ea5-adfe-a9983EXAMPLE</requestId> <hostSet> item> <releaseTime>2018-04-06T14:48:40.068Z</releaseTime> <instances/> <autoPlacement>on</autoPlacement> <hostRecovery>off</hostRecovery> <hostId>h-0abcd595047722123</hostId> <state>released</state> <allocationTime>2018-01-23T12:23:01.501Z</allocationTime> <hostProperties> <totalVCpus>96</totalVCpus> <cores>48</cores> <sockets>2</sockets> <instanceType>m5.large</instanceType> </hostProperties> <availabilityZone>us-east-1a</availabilityZone> </item> </hostSet> </DescribeHostsResponse>

See Also

For more information about using this API in one of the language-specific Amazon SDKs, see the following: