Version 2 UUIDs are DCE Security UUIDs, which are not widely used today. They are similar to Version 1 UUIDs but add additional fields for POSIX UID (User ID) and GID (Group ID). These identifiers are used in distributed computing environments. While it provides more information, it is not as common due to the potential security risks of embedding such identifiable information within the UUID. Furthermore, the complexity involved in generating and parsing these UUIDs has led to their decreased popularity. However, in specific legacy systems, you might still encounter Version 2 UUIDs due to their historical use.