Minecraft UUID Generator

What is UUID Minecraft (MC UUID)

UUIDs in Minecraft serve as unique identifiers to distinguish different object instances. In Minecraft, a Universally Unique Identifier (UUID) is a 128-bit number used to uniquely identify each object instance in the game, including players, mobs, drops, and more. UUIDs ensure that every entity can be uniquely recognized, even across different servers or games.

Application Scenarios

• Entity Identification: Each entity in Minecraft, such as players, mobs, and drops, has its corresponding UUID for differentiation and identification.
• Command Selectors: When using commands in the game, specific entities can be precisely selected through their UUIDs.
• NBT Data: The NBT (Named Binary Tag) data of certain entities includes UUID-type data, such as the SkullOwner.Id and SkullOwner.Properties.textures[].Value.ProfileId fields in player skulls.
• Player Authentication: For legitimate Minecraft players, UUIDs are used to identify players even after name changes, ensuring the uniqueness of player identities.

Technical Details

• Versions and Variants: Minecraft uses UUID version 4, variant 1 (RFC), which means that all parts except for the metadata (version and variant) are randomly generated.
• Format: UUIDs are typically represented in a hyphenated hexadecimal format, such as xxxxxxxx-xxxx-Axxx-Bxxx-xxxxxxxxxxxx, where A and B positions indicate the version and variant, respectively.
• Value Range: Each UUID can be represented as a 128-bit integer, supporting all integer values from -(2^127) to (2^127)-1.

Why Use UUIDs

• Uniqueness: The design goal of UUIDs is to ensure that any two UUIDs generated at any time and place are different, providing global uniqueness.
• Immutability: A player's UUID is unchangeable; even if a player changes their in-game name, the UUID remains the same for the identification of legitimate players' identities.

UUIDs play a crucial role in Minecraft, not only for technical entity identification and data storage but also for player identity management and verification. By using UUIDs, Minecraft can ensure the uniqueness and accuracy of identification for every entity within the game.