LAX-MEL--BNE--AKL--DRW--TYO--OSA--SHA--BKK--DEL--TLV--HEL--STO--OSL--LON--LAX--LAX
Assuming you're trying to do this on a OneWorld Explorer ticket that isn't even close to valid.
There are no eligible direct flights on DRW-TYO, SHA-BKK, DEL-TLV, TLV-HEL, STO-OSL, ...
16 segments means 16 flights each with its own number. If you need two flights with two different numbers then that's two segments.