The "Universally unique identifier", or UUID, identifies a consistent format for any unique ID to be used. The UUIDs are 128 bit long. UUID v4 is generated randomly without using any combination or logic.
UUID Version 4 (v4) Uniqueness
The UUID v4 is generated randomly. As it is not a combination of host machine address or time, it is not possible to identify the host machine details from the UUID. There is a possibility of duplication. However this is nearly impossible as there can be 2^128 combinations.