Wettersteinstrasse 18 Taufkirchen Bavaria 82024 DE
74:38:89:00:00:00 ====> 74:38:89:FF:FF:FF
The maximum devices for this prefix is 16777216 Possible devices,
This means that manufacturer can use this prefix to produce this amount of devices,but it didn't mean that he already manufactured them all or he had a plan to do.
And if This Manufacturer used all possible devices for this prefix he had to buy a new prefix from the IEEE to manufacture extra devices.