What is UUID v1?
Version 1 UUIDs are unique identifiers generated using a combination of the current timestamp and the MAC address (node) of the generating computer. This ensures globally unique IDs without central coordination, as long as the MAC address is unique.
Key Features
- Time-ordered: Contains a timestamp, making it possible to determine when the UUID was created.
- Guaranteed Uniqueness: Relies on the unique network card address (MAC) of the host.
- Format: 128-bit number displayed as 32 hexadecimal characters.
When to use UUID v1?
Use Version 1 when you need identifiers that are sortable by creation time or when you need absolute certainty of global uniqueness across distributed systems (provided MAC addresses are unique). However, be aware that v1 exposes the MAC address, which can be a privacy concern. For modern sortable UUIDs without privacy issues, consider UUID v7.