A Class C internet address, used for small networks, is a bit string of length $32.$ The first bits are $110($to identify it as a Class $C$ address$).$ The netid is given by the next $21$ bits, which identifies the network. The hostid is given by the remaining $8$ bits, which identifies the computer interface. The hostid must not consist of all $0\text{'}$s or all $1\text{'}$s$.$ How many Class C addresses are available?