UUID V1 Generator

What is UUID Version 1 (Timestamp UUID)

UUID Version 1 (Timestamp UUID) is a type of UUID that is generated based on time and a node identifier, typically the MAC address.

Creation of UUID Version 1

UUID Version 1 is created according to the definition in RFC 4122, based on the node ID, clock sequence, and the current time (the number of 100-nanosecond intervals since the Gregorian calendar change date [October 15, 1582]). The node ID is usually generated from the hardware address of the network interface, i.e., the MAC address. If no hardware address is available, a node ID is randomly generated.

Structure of UUID Version 1

The structure of UUID Version 1 is typically represented as: xxxxxxxx-xxxx-1xxx-xxxx-xxxxxxxxxxxx. Here, 1xxx indicates the version number, signifying that it is a time-based UUID.

Applications of UUID Version 1

UUID Version 1 is suitable for scenarios where unique identifiers with a temporal sequence need to be generated, such as log recording and audit tracking. Since it contains a timestamp, it can be used in contexts that require a chronological order.

Features of UUID Version 1

Time-based

The generation of UUID Version 1 relies on the current time, ensuring uniqueness in the temporal dimension.

Node Uniqueness

It ensures uniqueness in the spatial dimension through the MAC address or other node identifiers, meaning that even with the same timestamp, the UUIDs from different devices will be different.

Predictability

Due to its reliance on timestamps and MAC addresses, UUID Version 1 has a certain level of predictability, which may be disadvantageous in scenarios where information leakage needs to be avoided.

Conflict Probability

Although very low, there is a theoretical possibility of conflicts under extreme circumstances, such as if two UUIDs are generated at the same time by the same node, or if a clock rollback results in a timestamp duplication.