AWS CLI Command Reference

[ aws . kms ]

get-key-last-usage

Description

Returns usage information about the last successful cryptographic operation performed with a specified KMS key, including the operation type, timestamp, and associated CloudTrail event ID.

The TrackingStartDate in the GetKeyLastUsage response indicates the date from which KMS began recording cryptographic activity for a given key. Use this value together with KeyCreationDate to understand the key’s usage history:

  • If the KeyLastUsage response element is present , the key has been used for a successful cryptographic operation since the TrackingStartDate . The response includes the operation type, timestamp, and associated CloudTrail event ID.
  • If the KeyLastUsage response element is empty and KeyCreationDate is on or after TrackingStartDate , the key has not been used for a successful cryptographic operation since it was created.
  • If the KeyLastUsage response element is empty and KeyCreationDate is before TrackingStartDate , there is no record of the key being used for a successful cryptographic operation since the TrackingStartDate . However, the key may have been used before tracking began. To determine whether the key was used before the TrackingStartDate , examine your past CloudTrail logs.

For multi-Region KMS keys, primary and replica keys track last usage independently. Each key in a multi-Region key set maintains its own usage information.

The ReEncrypt operation uses two keys: a source key for decryption and a destination key for encryption. Usage information is recorded for both keys independently, each with the CloudTrail event ID from the respective key owner’s account.

Note

Do not use GetKeyLastUsage as the sole indicator when scheduling a key for deletion. Instead, first disable the key and monitor CloudTrail for DisabledException entries, as there could be infrequent workflows that are dependent on the key. By looking for this exception, you can identify potential dependencies and workload failures before they occur.

Cross-account use : No. You cannot perform this operation on a KMS key in a different Amazon Web Services account.

Required permissions : kms:GetKeyLastUsage (key policy)

Related operations:

  • DescribeKey
  • DisableKey
  • ScheduleKeyDeletion
Eventual consistency : The KMS API follows an eventual consistency model. For more information, see KMS eventual consistency .

See also: AWS API Documentation

Synopsis

  get-key-last-usage
--key-id <value>
[--cli-input-json | --cli-input-yaml]
[--generate-cli-skeleton <value>]
[--debug]
[--endpoint-url <value>]
[--no-verify-ssl]
[--no-paginate]
[--output <value>]
[--query <value>]
[--profile <value>]
[--region <value>]
[--version <value>]
[--color <value>]
[--no-sign-request]
[--ca-bundle <value>]
[--cli-read-timeout <value>]
[--cli-connect-timeout <value>]
[--cli-binary-format <value>]
[--no-cli-pager]
[--cli-auto-prompt]
[--no-cli-auto-prompt]
[--cli-error-format <value>]

Options

--key-id (string) [required]

Identifies the KMS key to get usage information for. To specify a KMS key, use its key ID or key ARN. Alias names are not supported.

Specify the key ID or key ARN of the KMS key.

For example:

  • Key ID: 1234abcd-12ab-34cd-56ef-1234567890ab
  • Key ARN: arn:aws:kms:us-east-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab

To get the key ID and key ARN for a KMS key, use ListKeys or DescribeKey .

Constraints:

  • min: 1
  • max: 2048

--cli-input-json | --cli-input-yaml (string) Reads arguments from the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, those values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally. This may not be specified along with --cli-input-yaml.

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. Similarly, if provided yaml-input it will print a sample input YAML that can be used with --cli-input-yaml. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command. The generated JSON skeleton is not stable between versions of the AWS CLI and there are no backwards compatibility guarantees in the JSON skeleton generated.

Global Options

--debug (boolean)

Turn on debug logging.

--endpoint-url (string)

Override command’s default URL with the given URL.

--no-verify-ssl (boolean)

By default, the AWS CLI uses SSL when communicating with AWS services. For each SSL connection, the AWS CLI will verify SSL certificates. This option overrides the default behavior of verifying SSL certificates.

--no-paginate (boolean)

Disable automatic pagination. If automatic pagination is disabled, the AWS CLI will only make one call, for the first page of results.

--output (string)

The formatting style for command output.

  • json
  • text
  • table
  • yaml
  • yaml-stream
  • off

--query (string)

A JMESPath query to use in filtering the response data.

--profile (string)

Use a specific profile from your credential file.

--region (string)

The region to use. Overrides config/env settings.

--version (string)

Display the version of this tool.

--color (string)

Turn on/off color output.

  • on
  • off
  • auto

--no-sign-request (boolean)

Do not sign requests. Credentials will not be loaded if this argument is provided.

--ca-bundle (string)

The CA certificate bundle to use when verifying SSL certificates. Overrides config/env settings.

--cli-read-timeout (int)

The maximum socket read time in seconds. If the value is set to 0, the socket read will be blocking and not timeout. The default value is 60 seconds.

--cli-connect-timeout (int)

The maximum socket connect time in seconds. If the value is set to 0, the socket connect will be blocking and not timeout. The default value is 60 seconds.

--cli-binary-format (string)

The formatting style to be used for binary blobs. The default format is base64. The base64 format expects binary blobs to be provided as a base64 encoded string. The raw-in-base64-out format preserves compatibility with AWS CLI V1 behavior and binary values must be passed literally. When providing contents from a file that map to a binary blob fileb:// will always be treated as binary and use the file contents directly regardless of the cli-binary-format setting. When using file:// the file contents will need to properly formatted for the configured cli-binary-format.

  • base64
  • raw-in-base64-out

--no-cli-pager (boolean)

Disable cli pager for output.

--cli-auto-prompt (boolean)

Automatically prompt for CLI input parameters.

--no-cli-auto-prompt (boolean)

Disable automatically prompt for CLI input parameters.

--cli-error-format (string)

The formatting style for error output. By default, errors are displayed in enhanced format.

  • legacy
  • json
  • yaml
  • text
  • table
  • enhanced

Output

KeyId -> (string)

The globally unique identifier for the KMS key.

Constraints:

  • min: 1
  • max: 2048

KeyLastUsage -> (structure)

Contains usage information about the last time the KMS key was used for a successful cryptographic operation. If the key has not been used since tracking began, this response element is empty.

Operation -> (string)

The last successful cryptographic operation the KMS key was used for. Absent if the key has not been used since KMS began tracking.

Possible values:

  • Decrypt
  • DeriveSharedSecret
  • Encrypt
  • GenerateDataKey
  • GenerateDataKeyPair
  • GenerateDataKeyPairWithoutPlaintext
  • GenerateDataKeyWithoutPlaintext
  • GenerateMac
  • ReEncrypt
  • Sign
  • Verify
  • VerifyMac

Timestamp -> (timestamp)

The date and time when the KMS key was most recently used for a successful cryptographic operation. Absent if the key has not been used since KMS began tracking.

CloudTrailEventId -> (string)

The CloudTrail eventId associated with the last successful cryptographic operation. Absent if the key has not been used since KMS began tracking.

KmsRequestId -> (string)

The KMS request ID associated with the last successful cryptographic operation. Absent if the key has not been used since KMS began tracking.

TrackingStartDate -> (timestamp)

The date from which KMS began recording cryptographic activity for this key, or the date the KMS key was created, whichever is later.

KeyCreationDate -> (timestamp)

The date and time when the KMS key was created.
© Copyright 2026, Amazon Web Services. Created using Sphinx.