uuidv3namespace

A UUIDv3 namespace refers to a predefined, universally unique identifier used in conjunction with the MD5 hashing algorithm to generate Version 3 Universally Unique Identifiers (UUIDs). UUIDs are 128-bit numbers used for identifying information in computer systems. Version 3 UUIDs are name-based, meaning they are generated by combining a namespace identifier and a name string.

The namespace acts as a context or domain for the name. When generating a UUIDv3, the system takes a specific namespace UUID and a given name string, concatenates them, and then computes the MD5 hash of this combined value. The resulting hash is then transformed into a UUIDv3. This process ensures that for a given namespace and name, the same UUID will always be generated.

Standard namespaces are provided for common use cases, such as the DNS namespace (for domain names), URL namespace (for URLs), OID namespace (for Object Identifiers), and X.500 DN namespace (for Distinguished Names). These predefined namespaces help ensure interoperability and prevent collisions when generating UUIDs for similar types of entities. For instance, if you want to generate a UUID for a specific domain name, you would use the DNS namespace UUID along with the domain name string. The deterministic nature of UUIDv3 generation makes them useful for scenarios where you need to consistently refer to the same entity without needing to store the UUID explicitly each time.