S3 API Compatibility

The S3 (Simple Storage Service) API has been the global standard for object storage for many years. It provides interoperability and compatibility of various object storage systems that adhere to this standard. IONOS S3 Object Storage has one of the highest levels of S3 API support.

IONOS S3 Object Storage lets users create the following two types of buckets:

1. Contract-owned buckets

2. User-owned buckets

Each of these bucket types offers a different feature set. For more information, see Bucket Types.

Starting May 30, 2024, all the newly launched S3 Endpoints have a contract owner as a bucket owner, and the administrator also holds the same set of permissions as a contract owner. You can continue creating user-owned buckets using specific endpoints, but the shift towards a contract-owned bucket model will be our primary focus for future features.

For more information, see IONOS S3 Object Storage API documentation.

Feature	Supported by contract-owned buckets	Supported by user-owned buckets
Bucket Create, Read, Update, Delete (CRUD)	Yes	Yes
Object CRUD	Yes	Yes
Object Copy	Yes, only for buckets without encryption.	Yes, cross-regional copying is not supported.
Multipart Uploads	Yes	Yes
Pre-Signed URLs	Yes	Yes
Bucket ACLs	Yes, but without the Logging Group.	Yes
Object ACLs	Yes	Yes
Block Public Access	Yes, only via the API.	Yes, only via the API.
Bucket Policy	Yes	Yes
CORS Configuration	Yes	Yes
Bucket Versioning	Yes	Yes
Bucket Replication	Not supported as contract-owned buckets are currently supported only in the eu-central-3 S3 region. But, you can replicate user-owned buckets to contract-owned buckets in the eu-central-3 S3 region. This function is supported both via the DCD and the API.	Yes, intraregional and cross-regional replication are supported.
Bucket Tagging	Yes, only via the API.	Yes, only via the API.
Object Tagging	Yes, only via the API.	Yes, only via the API.
Bucket Lifecycle	Yes	Yes
Bucket Access Logging	No	Yes
Bucket Encryption Configuration	Yes, only via the API.	Yes, only via the API.
Object Encryption	Yes, server-side encryption is used by default in the web interface. The encryption with customer-managed encryption keys is available via the API.	Yes, server-side encryption is used by default in the web interface. The encryption with customer-managed encryption keys is available via the API.
Bucket Website	Yes, including support for redirects through the API reference.	Yes
Bucket Inventory	No	Yes, only via the API.
Object Lock	Yes	Yes
Legal Hold	Yes	Yes
Object Ownership	No	Yes
Identity and Access Management (IAM)	No, available in the near future.	No
Security Token Service (STS)	No	No
Multi-factor Authentication	No	No
Bucket Notifications	No	No
Request Payment	Yes	No
Bucket Metrics	No	No
Bucket Analytics	No	No
Bucket Accelerate	No	No
IONOS S3 Select	Yes	No