Registrants requesting non SMPTE-controlled ULs (in Classes 13 & 14) may choose any version byte value they desire.
Two ULs which differ only in terms of their version byte are not allowed.
The Registers snapshots shall not have version numbers because this would be confusing: from the version byte of a UL alone it is not possible to say which snapshot of the Register in which the entry first appears.
What does the UL version byte tell you about a UL?
It tells you the “era” in which work begun on the Registers Submission that created the UL
Per AG-18, current version bytes are listed on the SMPTE Registration Authority website.