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 Object Storage has one of the highest levels of S3 API support.

IONOS 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 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 Object Storage API documentation.

Feature list

Feature Supported Based on the Bucket Type

This section highlights the Object Storage features that are supported depending on the bucket type. It also highlights the features that are supported only through the API.

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 through the API.	Yes, only through the API.
Bucket Policy	Yes	Yes
CORS Configuration	Yes	Yes
Bucket Versioning	Yes	Yes
Bucket Replication	Cross-regional bucket replication is not supported for contract-owned buckets but will be available soon. You can only replicate user-owned buckets to contract-owned buckets. This function is supported both through the DCD and the API.	Yes, intraregional and cross-regional replication are supported.
Bucket Tagging	Yes, only through the API.	Yes, only through the API.
Object Tagging	Yes, only through the API.	Yes, only through the API.
Bucket Lifecycle	Yes	Yes
Bucket Access Logging	No	Yes
Bucket Encryption Configuration	Yes, only through the API.	Yes, only through 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 through the API.	Yes, server-side encryption is used by default in the web interface. The encryption with customer-managed encryption keys is available through the API.
Bucket Website	Yes, including support for redirects through the API reference.	Yes
Bucket Inventory	No	Yes, only through 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
Object Query	Yes	No