The Universal Unique Identifier, which is also popularly known at the Globally Unique Identifier (GBI) is the representative for 128- bit which is along with value as well as unique in practical and its purpose. A standard representation of UUID uses the hex digits octets.
UUID is made from hex digit which forms four chats each of which comes along with 4-inch symbol making the length to be equivalent to 36 characters. However, a perfect example of UUID is the unique Nil UUID where all bits are set to zero points.
What does UUID do?
The 128 bits of UUID is used for identification in software development. It is a section of Distributed Computing Environment (DCE) which is standardized by the Open Software Foundation (OSF). UUID work with a mission of high uniqueness posting high electronic challenge.
Version of UUID
The most commonly used version of UUID is version and 5. Generally, UUID is developed by the help of hash of namespace and the name. Namespace identifier is the Domain Name System (DNS), URLs, and the Object Identifiers (OIDS).
Version three and five differ due to Hashing Algorithm. Version three employs the MD5 whereas V5 utilizes SHA-1. In simple terms, this translates to 128 bits which get replaced with 4 bits and 2 bits for a variant – read article on it project development methodologies.
UUID such as version 3 and 5 has an excellent release and property that help in differencing systems which generate the same UUID. This means to come up with a different UUID; there is need to use V3 and V5 together.
Additionally, the use of the same namespace and name helps in creating a different version of UUID. All these aspects are generally used in creating a hierarchical of UUIDs if you need a simple and easy to manage UUID, its advisable to use V3 in all development.