Attack npc packet on int

01/03/2018 20:04 HighGamer.#1
How do I generate these 2 bytes?

The first 4 bytes are the npc id
the next 2 bytes I cannot figure it out they are always different

Code:
0C 00 11 01 [E3 55 7B 00] [B9 43] 00 00 
0C 00 11 01 [06 06 73 00] [68 44] 00 00 
0C 00 11 01 [BC F4 6D 00] [75 44] 00 00
edit figured it out its the Z coordinate from /coordinates