UA
Unassignable Codes (e.g. N11, 555, 700, Home NPA, Test Codes, Set Aside Codes, etc.)
RV
Reserved for future use by a Code Holder.
PR
Codes protected for permissive dialing during a split.
AS
Assigned to a code holder (e.g., Wireless, ILEC, CLEC) for normal use.
VC
Vacant code (available for assignment).