In class B, the first two octets(16 bits) represent network address and out of these 16 bits first two bits are fixed(10) to specify that its class B and remaining 14 bits represent 214 networks, and each network has 216 - 2 hosts.Hence, the first two bits of the first octet of an IP Class-B address is always 10Note:IP address is an address having information about how to reach a specific host. The 32 bit IP address is divided into five sub classes. These are:1) Class A2) Class B3) Class C4) Class D5) Class EClass D and E are reserved for multicast and experimental purposes.IPv4 addresses are divided into two parts: a) Network ID b) Host IDClass A: This class uses 24 bits for network ID part and 8 bit for host ID.Class B: This class uses 16 bits for network ID and 16 bits for host ID.Class C: This class uses 8 bits for network ID and 16 bits for host ID.