UUID Generator

UUID v1 (time-based)

Use: Distributed DB primary key, file/event time-series IDs, legacy API compatibility
Feature: Generated from timestamp + hardware ID. Sortable by generation order. Low anonymity.
Detail: 128 bits: 60 bits timestamp, 48 bits node ID (MAC/random), rest version/counter.

Example: f81d4fae-7dec-11d0-a765-00a0c91e6bf6

UUID v4 (random)

Use: Session IDs, API tokens, unique IDs for web apps
Feature: Cryptographically random. Very high anonymity and uniqueness.
Detail: 128 bits: 122 random, 6 version/variant. Collision risk nearly zero.

Example: 109156be-c4fb-41ea-b1b4-efe1671c5836

UUID v7 (sortable, time-based)

Use: Log/event streams, NoSQL/new-gen DB primary keys, order-guaranteed use cases
Feature: Timestamp + random for sortability and anonymity. Recommended for new-gen DBs.
Detail: 128 bits: 48 UNIX ms, 80 random. RFC4122bis draft.

Example: 01890bcb-1965-7cc8-8e8c-17c63e6e6b4b

Number of UUIDs to generate (1-100)

Result

45476b22-5c1d-443b-a8c5-67bf3914d3ee