There is a block of addresses 218.94.21.0/24.
Please denote the block of addresses in binary system.
Please create four subnets (of form a.b.c.d/x) from the addresses at the same size. the four subnet are ( )、（ ）、（ ）and ( ). please use the form of a.b.c.d/x, such as 218.94.21.0/24 for each blank.
What is the range of host id for the sub-network 218.94.21.64/26?