Only classful network why?

Only classful network why?
Only classful network why?
2013-09-01 01:17:53
Region : Germany

Model : TL-MR3220

Hardware Version : V2

Firmware Version : 3.13.27 Build 121206 Rel.60215n

ISP : Eplus


Why can't i use class B address with 16bit sub?

Thanks.
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