The basic difference between Master AWB and House AWB is that
Master AWB is issued by an airline whereas House AWB is issued by a
Freight Forwarding Agent.
In the top right column of the AWB, you can find the name of the
airline or the freight forwarding agent who has issued the AWB. If
an airline's name is mentioned in the top right column of the AWB
then it is a Master Airway Bill otherwise it is a House Airway
Bill.