Are all of the OpIDs globally unique?
An OpID allocated by the IEEE Registration Authority is assigned to a single applicant. The assignee is guaranteed that the same number is not assigned to any other entity. Furthermore, the set of OpIDs that are assigned is disjoint from the set of OpIDs that may be derived from an E.212 MCC-MNC. The IEEE Registration Authority does not guarantee the MCC-MNC pair is unique, but if all operators respect the rules for generating OpIDs, the OpID will be unique, since the same OpD cannot be derived from two different E.212 MCC-MNC assignments. Any OpID selected from the public pool is not guaranteed to be unique, as two operatpors may coincidently choose the same OpID. An operator that opts for an OpID from the public pool of numbers must assess the consequences of another operator choosing the same OpID. For operators of a home or small enterprise network, the consequences may be insignificant, and chosing an operator ID from the public pool is a viable option.
