Generate time-based universally unique identifiers (UUIDs) with our free online tool. Perfect for distributed systems, chronological tracking, and applications that benefit from timestamp-embedded identifiers.
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How many UUIDs? (max 1000)
A UUID Version 1 (Universally Unique Identifier) is a 128-bit time-based identifier that combines the current timestamp with the node identifier (typically MAC address) of the generating computer. These identifiers are sequentially ordered within the same system and provide chronological context within their structure.
UUID Version 1 is particularly valuable for:
Version 1 UUIDs are generated using the current timestamp and the node identifier. They follow the format:xxxxxxxx-xxxx-1xxx-yxxx-xxxxxxxxxxxxWhere the '1' indicates version 1, and 'y' is one of 8, 9, A, or B. The timestamp portion represents 100-nanosecond intervals since October 15, 1582 (the beginning of the Gregorian calendar).
Our time-based UUID generator tool provides:
UUID v1 is time-based and sequential, incorporating timestamps and node identifiers, while UUID v4 is randomly generated. UUID v1 provides chronological ordering and can be more efficient to generate, while UUID v4 offers better privacy since it doesn't expose system information or creation time.
Yes, UUID v1 contains embedded timestamp information that can be extracted with the right tools or algorithms. This makes UUID v1 valuable for applications where knowing the exact creation time of an identifier is important without needing separate timestamp storage.
Traditional UUID v1 implementations include the MAC address of the generating computer, which could potentially expose hardware information. Modern implementations often use privacy-enhanced approaches like randomly generated node identifiers to mitigate this concern. Our tool implements privacy-conscious generation methods.
UUID v1 values generated on the same system will have sequential timestamp components, making them sortable by creation time. This makes them useful for database indexing and applications where temporal ordering is beneficial. However, UUIDs generated across different systems may not maintain perfect global sequence.
Yes, UUID v1 values can make excellent database primary keys, especially in distributed systems. Their time-ordered nature can provide performance benefits for B-tree indexes compared to random UUIDs. However, their sequential pattern may be more predictable than random UUIDs, which could be a consideration for some security-sensitive applications.