AWS CloudTrail
User Guide (Version 1.0)

The AWS Documentation website is getting a new look!
Try it now and let us know what you think. Switch to the new look >>

You can return to the original look by selecting English in the language selector above.

Amazon S3 Bucket Naming Requirements

The Amazon S3 bucket that you use to store CloudTrail log files must have a name that conforms with naming requirements for non-US Standard regions. Amazon S3 defines a bucket name as a series of one or more labels, separated by periods, that adhere to the following rules:

  • The bucket name can be between 3 and 63 characters long, and can contain only lower-case characters, numbers, periods, and dashes.

  • Each label in the bucket name must start with a lowercase letter or number.

  • The bucket name cannot contain underscores, end with a dash, have consecutive periods, or use dashes adjacent to periods.

  • The bucket name cannot be formatted as an IP address (


Because S3 allows your bucket to be used as a URL that can be accessed publicly, the bucket name that you choose must be globally unique. If some other account has already created a bucket with the name that you chose, you must use another name. For more information, see Bucket Restrictions and Limitations in the Amazon Simple Storage Service Developer Guide.