**To list all MFA devices for a specified user** This example returns details about the MFA device assigned to the IAM user ``Bob``:: aws iam list-mfa-devices --user-name Bob Output:: { "MFADevices": [ { "UserName": "Bob", "SerialNumber": "arn:aws:iam::123456789012:mfa/BobsMFADevice", "EnableDate": "2015-06-16T22:36:37Z" } ] } For more information, see `Using Multi-Factor Authentication (MFA) Devices with AWS`_ in the *Using IAM* guide. .. _`Using Multi-Factor Authentication (MFA) Devices with AWS`: http://docs.aws.amazon.com/IAM/latest/UserGuide/Using_ManagingMFA.html